- document
- Churchill, Ruel V. (author) book 1948
- document
- Milne-Thomson, L. (author) book 1948
- document
- de Vries, J.E. (author) book 1947
- document
- Acevedo, Manuel L. (author) book 1943
- document
- Rothe, Rudolf (author) book 1939
- document
- Rothe, Rudolf (author) book 1938
- document
- Rothe, Rudolf (author) book 1938
- document
- Kellogg, O.D. (author) book 1929
- document
- Schuh, Fred (author) report 1922
- document
- Kiepert, Ludwig (author) book 1918