- [S34] Clark County Genealogical Society, Clark County Washington Marriages (Vancouver, Washington: Clark County Genealogical Society, 1994).
- [S62] Gerry Gilman, compiler, Knapp Mortuary Funerals (Vancouver, Washington: Clark County Genealogical Society, unknown publish date).
- [S152] William G. Gapsch household, 1920 U.S. Census, Multnomah Co., Oregon, population schedule, Portland, Enumeration District 4, sheet 18A, dwelling 230, family 422, National Archives micropublication T625-1498, viewed at Fort Worth Branch Archives May 1999.
- [S155] John Gann household, 1850 U.S. Census, Lycoming Co., Pennsylvania, population schedule, Limestone Twp., sheet 567/286, dwelling 110, family 110, National Archives micropublication T432-795, viewed at Fort Worth Branch Archives May 1999.
- [S244] Portland City Directory 1890, including Directories of Albina, East Portland, Fulton, Mt. Tabor, Sellwood, Willsburn, Oregon City and Vancouver, Wash. (Portland, Oregon: R. L. Polk & Co., 1890), copies of title page and selected pages obtained from Lineages Inc., Salt Lake City, Utah May 2000.
- [S245] Portland City Directory 1890, including Directories of Albina, East Portland, Fulton, Mt. Tabor, Sellwood, Willsburn and Vancouver, Wash. (Portland, Oregon: R. L. Polk & Co., 1891), copies of title page and selected pages obtained from Lineages Inc., Salt Lake City, Utah May 2000.
- [S261] Robert Edward Gapsch, Certificate of Death, 217 (14 Jul 2000), issued by Bureau of Vital Statistics Washington State Department of Health, PO Box 9709, Olympia, Washington 98507, author, Boone, North Carolina, filed 26 Jun 1946.
- [S262] Matilda Gapsch, Certificate of Death, 32 (14 Jul 2000), issued by Bureau of Vital Statistics Washington State Board of Health, PO Box 9709, Olympia, Washington 98507, author, Boone, North Carolina, filed 2 Apr 1926.
- [S401] Jack D. Parsons, "Jenold - Tenold?," e-mail message to author, 5 Feb 2001. Writer's wife is the daughter of Flora Marie (Erstad) Mills, daughter of Alma Cecelia Tenold by her second husband, Edwin Gunnar Erstad.
- [S418] Robert E. Gapsch household, 1920 U.S. Census, Riverside Co., California, population schedule, Beaumont, Enumeration District 97, sheet 4A, dwelling 108, family 110, National Archives micropublication T625-125, viewed on Ancestry.com.
- [S669] Weser arrival 23 Mar 1881, Passenger Lists of Vessels Arriving at New York, New York, 1820-1897, Arrival No. 311, National Archives Microfilm No. M237, roll 434, viewed at St. Louis Public Library 22 Jan 2004.
- [S815] Interview with Alvina (Gapsch) Myers (Fenton, Missouri), by author, 1 Jan 2004. by telephone.
- [S1380] Alvina Louise Gapsch, Delayed Certificate of Birth, DF-1855, issued by Oregon State Board of Health, Oregon State Archives, 800 Summer St. NE, Salem, Oregon, filed 17 Feb 1953. Copy obtained from Archives Mar 2008.
- [S1384] Albert Henry Johnson, baptismal certificate, issued by unknown church, Oregon State Archives, 800 Summer St. NE, Salem, Oregon, filed 21 May 1893. Document was provided as evidence supporting his delayed birth certificate. Copy obtained from Archives Mar 2008.
- [S1386] "HisKi project," online on Genealogical Society of Finland website, hiski.genealogia.fi/historia/indexe.htm, a project to index church records of christenings, marriages, burials and moves.
- [S1400] May Hoggatt, Certificate of Death, 13631, issued by Missouri State Board of Health, filed 21 Mar 1917. Image found online on Missouri Secretary of State website, <http://www.sos.mo.gov/archives/resources/deathcertificates>. Informant was W. M. Hoggatt, her husband.
- [S1430] "Articles of Incorporation," Morning Olympian, Olympia, Washington, 29 Jul 1908, pg 2. Image found on GenealogyBank.com.
- [S1443] Robert Edward Gapsch, declaration of intention, (10 Feb 1917); Washington State Archives, 1129 Washington St. SE, Olympia, Washington. Image copy obtained from Archives May 2008.
- [S1739] William G. Gapsch household, 1930 U.S. Census, Multnomah Co., Oregon, population schedule, Portland, Enumeration District 26, sheet 5A, dwelling 117, family 116, National Archives micropublication T626-1954, viewed on Ancestry.com.
- [S1843] Robert Gapsch household, 1930 U.S. Census, Clark Co., Washington, population schedule, Vancouver, Enumeration District 6, sheet 7B, dwelling 97, family 132, National Archives micropublication T626-2485, viewed on Ancestry.com.
- [S1890] Moritz Gapsch household, 1920 U.S. Census, St. Louis Co., Missouri, population schedule, Affton, Enumeration District 118, sheet 1B, dwelling 20, family 20, National Archives micropublication T625-945, viewed on Ancestry.com.
- [S1930] Ole Erstad household, 1900 U.S. Census, Clark Co., Washington, population schedule, Cathlapoodle, Enumeration District 23, sheet 4A, dwelling 74, family 74, National Archives micropublication T623-1742, viewed on Ancestry.com.
- [S2102] Monika Langheinrich, "Trauung [marriage]: Friedrich, Wilhelm Eduard Gapsch and Sophie Herfurt", transcript of marriage entry 1864, no. 12, pg 4, 11 Dec 2008. From Altenhof parish records, Ev.-Luth. Pfarramt Altenhof, Kirchplatz 3, 04703 Leisnig, transmitted by letter to Vera Nagel 11 Dec 2008. Copy and translation supplied to author by Vera Nagel by email "GAPSCH christenings and marriages -Altenhof-" 19 Dec 2008. Currently held by author, Boone, North Carolina.
- [S2121] Monika Langheinrich, "Taufeintrag [christening]: Eduard Robert Herfurth", transcript of christening entry 1863, no. 32, pg 240, 23 Jan 2009. From Altenhof parish records, Ev.-Luth. Pfarramt Altenhof, Kirchplatz 3, 04703 Leisnig, transmitted by letter to Vera Nagel 23 Jan 2009. Copy and translation supplied to author by Vera Nagel by email "Eduard Robert Herfurth / Gapsch :-))" 25 Jan 2009. Currently held by author, Boone, North Carolina.
- [S2853] Howard Vernon Gapsch, Soc. Sec. No. 544-22-4709, 12 Sep 1942, Application for Account, U.S. Social Security Administration, Baltimore, Maryland.
- [S2856] Robert Edward Gapsch, Soc. Sec. No. 535-18-5228, 09 Nov 1940, Application for Account, U.S. Social Security Administration, Baltimore, Maryland.
- [S2872] Edward Henry Gapsch, Soc. Sec. No. 533-10-0083, 25 Nov 1936, Application for Account, U.S. Social Security Administration, Baltimore, Maryland.
- [S2874] Harold Oscar Gapsch, Soc. Sec. No. 543-20-1121, 04 Jun 1942, Application for Account, U.S. Social Security Administration, Baltimore, Maryland.
- [S2879] William Gustav Gapsch, Soc. Sec. No. 542-03-9584, 30 Nov 1936, Application for Account, U.S. Social Security Administration, Baltimore, Maryland.
- [S3165] Mrs. Mitilda Gapsch obituary, The Oregonian, Portland Oregon, 20 Mar 1926, pg 16. Image found on GenealogyBank.com.
- [S3176] Orlando departure 19 Oct 1888, Göteborgs Poliskammare 1869-1950 [Gothenburg, Passenger Lists], Landsarkivet i Göteborg, Göteborg, Sweden, Microfilm No. EIX 1-143, roll 10, Image found online on Ancestry.com.
- [S3177] Egypt arrival 9 Nov 1888, Passenger Lists of Vessels Arriving at New York, New York, 1820-1897, arrival no. 1520, National Archives Microfilm No. M237, roll 526, Image found online on Ancestry.com.
- [S3238] Rippikirja [church census], Ähtävä, Finland, 1858-1866, microfilm Mko 67-76, National Archives, Helsinki, Finland, images found on Finland's Family History Association website,. <http://www.digiarkisto.org/sshy/index_eng.htm
- [S4552] Robert E. Gapsch household, 1940 U.S. Census, Clark Co., Washington, population schedule, Vancouver, Enumeration District 6-66, sheet 2B, family 53, National Archives micropublication T627-4335, informant was Charlotte, wife of head of household, viewed on Ancestry.com.
- [S4628] Ken Betts, "RE: William David Riegel," e-mail message (Albuquerque, New Mexico) to author, 15 Aug 2014. writer is grandson of Alice Matilda (Reigle) Bryant.
- [S5295] William G. Gapsch household, 1940 U.S. Census, Multnomah Co., Oregon, population schedule, Portland, Enumeration District 37-446, sheet 4A-B, family 91, National Archives micropublication T627-3393, informant was Anna, wife of head of household, viewed on Ancestry.com.
- [S5408] "Circuit Court," The Marshfield Mail, Marshfield, Missouri, 21 Sep 1911, pg 2.
- [S5907] John Gann Jr. household, 1840 U.S. Census, Lycoming Co., Pennsylvania, Limestone Twp., page 130, line 14, National Archives micropublication M704-473, viewed on Ancestry.com.
- [S5908] John Gunn household, 1830 U.S. Census, Susquehanna Co., Pennsylvania, Adams Twp., page 221, line 39, National Archives micropublication M19-166, viewed on Ancestry.com.
- [S5912] John Gann household, 1810 U.S. Census, Lycoming Co., Pennsylvania, page 833, line 16, National Archives micropublication M252-52, viewed on Ancestry.com.
- [S5913] John Gunn household, 1820 U.S. Census, Lycoming Co., Pennsylvania, Limestone Twp., page 1, line 6, National Archives micropublication M33-107, viewed on Ancestry.com.
- [S5915] Rachel Dudley, Certificate of Death, 41157, issued by Commonwealth of Pennsylvania Department of Health, filed 12 Apr 1932. Informant was Margaret Dudley, relationship unknown. Image found online on Ancestry.com.
- [S5916] William Gann, Certificate of Death, 51219, issued by Commonwealth of Pennsylvania Department of Health, filed 18 May 1908. Informant was A. M. Gann, his son. Image found online on Ancestry.com.
- [S5933] Catharine Grier, Certificate of Death, 66401, issued by Commonwealth of Pennsylvania Department of Health, filed 23 Jul 1907. Informant was Amanda Grier, her daughter. Image found online on Ancestry.com.
- [S5962] Mary Elizabeth Pearson, Certificate of Death, 107589, issued by Commonwealth of Pennsylvania Department of Health, filed 3 Nov 1914. Informant was Geo. W. Pearson Sr., her husband. Image found online on Ancestry.com.
- [S6069] Will Books, Lycoming Co., Pennsylvania, Lycoming County Register and Recorder, 48 West 3rd. St., Williamsport, Pennsylvania.
- [S6070] Orphans Court Dockets, Lycoming Co., Pennsylvania, Lycoming County Register and Recorder, 48 West 3rd. St., Williamsport, Pennsylvania.
- [S7298] Robert Gapsch and Matilda Hendrickson, marriage return, no. 417 (4 Jun 1890), Genealogical Forum of Oregon, 2505 S.E. 11th Ave., Portland, Oregon. Image provided by Laurel Smith, president of GFO by email "RE: General Message Notification" 18 Dec 2016.
- [S7357] Robert Edward Gapsch, petition for naturalization, C-1534331 (4 Jan 1922); U.S. Citizenship and Immigration Services, Washington, District of Columbia. Copy obtained from Service Jan 2017 under case no. GEN-10131367.
- [S7358] Robert Edward Gapsch, Certificate of Naturalization, C-1534331 (26 Jun 1922); U.S. Citizenship and Immigration Services, Washington, District of Columbia. Copy obtained from Service Jan 2017 under case no. GEN-10131367.