1910-04-07/1913-11-15Duration of the third internship of Cornelis Koorstra1910-04-07/1914-02-211910-04-07/1914-07-231910-04-07/1913-11-271910-04-07/1913-05-311910-04-07/1913-03-281910-04-07/1913-12-131910-04-07/..1910-04-07/1913-01-181910-04-07/1912-08-201910-04-07/..1910-04-07/1912-07-261910-04-07/1912-08-311910-04-07/1914-09-041910-04-07/..1910-04-07/1913-04-12
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1910-04-07
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1910-04-07