A2Acollection via https://opendata.archieven.nl/dataset/A8E1B51BC1E1402B9699B27D14A6B870
NNA Obdam 144, notaris Henrich Bernardus Gottmer, 1912 mei-juli
Westfries Archief, Hoorn, NNA Obdam 144, notaris Henrich Bernardus Gottmer, 1912 mei-juli, NNA Obdam 144, notaris Henrich Bernardus Gottmer, 1912 mei-juli, 144