| 1 |
A guide to the constellations / by Samuel G. Barton and Wm.H. Barton, Jr
1st ed. - New York : Whittlesey House , c1928
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| 2 |
Practical astronomy / by Jason John Nassau
2nd ed. - New York : McGraw-Hill , 1948.
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| 3 |
Determination of orbits of comets and asteroids / by Russell Tracy Crawford
1st ed.. - New York ; London : McGraw-Hill , 1930
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| 4 |
Astrophysics : a topical symposium : commemorating the fiftieth anniversary of the Yerkes Observatory and a half century of progress in astrophysics / J.A. Hynek, editor
New York : McGraw-Hill , 1951
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