We have a total of 31 records for people with the last name Koolen.
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Peter
Johannes
Anna
Johanna
Men and women often performed different types of jobs, so these are displayed by gender to maintain their historical accuracy.
Commmon female occupations for Koolens in 1921
Clerk Merchants Office
1
Commmon male occupations for Koolens in 1921
Tool Maker
1
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1