A2Acollection via https://opendata.archieven.nl/dataset/0FEB5EECA7E1455FA644E28047018642
NNA Obdam 178, notaris Henrich Bernardus Gottmer, 1919 mei-juli
Westfries Archief, Hoorn, NNA Obdam 178, notaris Henrich Bernardus Gottmer, 1919 mei-juli, NNA Obdam 178, notaris Henrich Bernardus Gottmer, 1919 mei-juli, 178