A2Acollection via https://opendata.archieven.nl/dataset/26300134D36D40418F15B0816E25B70D
NNA Avenhorn 188, notaris Hendrik Jan Jacob Verhoeff, 1925 jan-maa
Westfries Archief, Hoorn, NNA Avenhorn 188, notaris Hendrik Jan Jacob Verhoeff, 1925 jan-maa, NNA Avenhorn 188, notaris Hendrik Jan Jacob Verhoeff, 1925 jan-maa, 188