A2Acollection via https://opendata.archieven.nl/dataset/A0EDED3729F647E2BBA268E4A18CD588
NNA Avenhorn 160, notaris Hendrik Jan Jacob Verhoeff, 1916 jan-apr (aktenrs 7-148)
Westfries Archief, Hoorn, NNA Avenhorn 160, notaris Hendrik Jan Jacob Verhoeff, 1916 jan-apr (aktenrs 7-148), NNA Avenhorn 160, notaris Hendrik Jan Jacob Verhoeff, 1916 jan-apr (aktenrs 7-148), 160