Rutherfurd photographs of stars surrounding 59 Cygni
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
New York
The New Era Printing
1908.
|
| Cyfres: | Contributions from the Observatory of Columbia University
no. 25 |
| Pynciau: |