A2Acollection via https://opendata.archieven.nl/dataset/596A56D8AD554DF6ADB73E243CE02C47
NNA Obdam 99, notaris Henrich Bernardus Gottmer, 1903 maa-apr
Westfries Archief, Hoorn, NNA Obdam 99, notaris Henrich Bernardus Gottmer, 1903 maa-apr, NNA Obdam 99, notaris Henrich Bernardus Gottmer, 1903 maa-apr, 99