A2Acollection via https://opendata.archieven.nl/dataset/D6B30960DA9143489896FEA03182AE4D
NNA Hoorn 226, notaris Cornelis Petrus Donker, 1916 jan-maa
Westfries Archief, Hoorn, NNA Hoorn 226, notaris Cornelis Petrus Donker, 1916 jan-maa, NNA Hoorn 226, notaris Cornelis Petrus Donker, 1916 jan-maa, 226