2
Author: Pannekoek, Anton, 1873-1960.
Published 1919
Record Source: Published Materials
Book
3
5
Author: Bonger, Willem Adriaan, 1876-1940.
Published 1969
Record Source: Published Materials
Book
7
8
Published 1967
Record Source: Published Materials
Book
9
Published 1892
Record Source: Published Materials
Serial
11
Record Source: Published Materials
Journal
12