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- [S90] FamilySearch, (Kirche Jesu Christi der Heiligen der Letzten Tage).
"United States Census, 1870," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:S3HT-DHG7-ZFG?cc=1438024&wc=KPRW-2NL%3A518663701%2C518654602%2C518704101 : 8 June 2019), District of Columbia > Washington > Washington City, ward 2 > image 99 of 470; citing NARA microfilm publication M593 (Washington, D.C.: National Archives and Records Administration, n.d.).
- [S90] FamilySearch, (Kirche Jesu Christi der Heiligen der Letzten Tage).
"United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:33SQ-GYB4-666?cc=1417683&wc=XC7K-MNL%3A1589399659%2C1589395180%2C1589395469%2C1589395700 : 24 December 2015), District of Columbia > Washington > Washington > ED 50 > image 25 of 52; citing NARA microfilm publication T9, (National Archives and Records Administration, Washington, D.C., n.d.)
- [S90] FamilySearch, (Kirche Jesu Christi der Heiligen der Letzten Tage).
"United States Census, 1860," database with images, FamilySearch (https://familysearch.org/ark:/61903/3:1:33SQ-GYBY-GXP?cc=1473181&wc=7QCB-J1R%3A1589423426%2C1589422318%2C1589423886 : 24 March 2017), District of Columbia > Washington > 2nd Ward Washington City > image 24 of 238; from "1860 U.S. Federal Census - Population," database, Fold3.com (http://www.fold3.com : n.d.); citing NARA microfilm publication M653 (Washington, D.C.: National Archives and Records Administration, n.d.).
- [S503] Find a grave.
Find a Grave, Datenbank und Bilder (https://de.findagrave.com/memorial/136113390/mathias-b-elbert: aufgerufen 20 Januar 2023), Gedenkstättenseite für Mathias B Elbert (1854–30 Mrz 1925), Gedenkstätten-ID bei Find a Grave 136113390, zitierend Mount Olivet Cemetery, Washington, District of Columbia, District of Columbia, USA; Verwaltet von Emile and Charlotte (Mitwirkender 47676085).
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