A2Acollection via https://opendata.archieven.nl/dataset/E2311B55170542F1934B112DB3759152
NNA Obdam 100, notaris Henrich Bernardus Gottmer, 1903 mei-juli
Westfries Archief, Hoorn, NNA Obdam 100, notaris Henrich Bernardus Gottmer, 1903 mei-juli, NNA Obdam 100, notaris Henrich Bernardus Gottmer, 1903 mei-juli, 100