"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MF82-5V5 : accessed 8 January 2015), Derk Plasman, Holland, Ottawa, Michigan, United States; citing family 39, NARA microfilm publication M432 (Washington, D.C.: National Archives and Records Administration, n.d.).
Derk Plasman (1799 – 1854) and Aaltje Amsink (c1802 – ) married 28 Apr 1827, Gramsbergen
emigrated from Hardenberg via Arnhem on 24 September 1846, left Hellevoetsluis on Southerner 2 October 1846, arrived New York 19 November 1846, a small, advance group arrived in West Michigan on 9 February 1847 Willem, 1828- Fredrik, 1835- Jennigje, 1838- from First Holland RCA, living in Holland Twp. [2]