1
Author: Pannekoek, Anton, 1873-1960.
Published 1919
Record Source: Published Materials
Book
2
4
Author: Bonger, Willem Adriaan, 1876-1940.
Published 1969
Record Source: Published Materials
Book
6
7
Published 1967
Record Source: Published Materials
Book
8
Published 1892
Record Source: Published Materials
Serial
10
Record Source: Published Materials
Journal
11