1
Published: 1937
Superior document: Contributions from the McDonald Observatory 4
2
Published: 1938
Superior document: Contributions from the McDonald Observatory 6
3
Published: 1938
Superior document: Contributions from the McDonald Observatory 8
4
Published: 1937
Superior document: Contributions from the McDonald Observatory 3
5
Published: 1938
Superior document: Contributions from the McDonald Observatory 7
6
Published: [1936]
Superior document: Contributions from the McDonald Observatory 2