3
Author: Pos, Mary.
Published 1949
Record Source: Published Materials
Book
5
Author: Pannekoek, Anton, 1873-1960.
Published 1919
Record Source: Published Materials
Book
6
Record Source: Published Materials
Serial
9
Author: Beets, Henry, 1869-1947.
Published 1909
Record Source: Published Materials
Book
10
Author: Vries, Hugo de, 1848-1935.
Published 1905
Record Source: Published Materials
Book
11
12
14
Published 1883
Record Source: Published Materials
Journal
16
Author: Dosker, N. H. 1820-1887.
Published 1888
Record Source: Published Materials
Book
18
Author: Bultema, Harry.
Published 1921
Record Source: Published Materials
Book
19
Author: Stuart, Martinus Cohen.
Published 1875
Record Source: Published Materials
Book