Check the information Open Archives has about Blanckema.
Check the Wie (onder)zoekt wie? register to see who is (re)searching Blanckema.
The Genealogische database Eisenga publication was prepared by Ruut Eisenga (contact is not possible).
When copying data from this family tree, please include a reference to the origin: Ruut Eisenga, "Genealogische database Eisenga", database, Genealogy Online (https://www.genealogieonline.nl/genealogie-eisenga/I3266.php : accessed February 19, 2026), "Hendrick Hendricks Blanckema (1638-< 1697)".
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Request permission to copy data or at least inform the author, chances are that the author gives permission, often the contact also leads to more exchange of data.
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