Gingrich, Curvin H. |
A determination of the photographic magnitudes of comparison stars in certain of the hagen fields / C.H. Gingrich |
[S.l. : s.n., 1913?] |
Popular astronomy : a review of astronomy and allied sciences / founded by W.W. Payne; editor Herbert C. Wilson ; associate editor Curvin H. Gingrich |
Northfield (Minn.) : published under the auspices of Goodsell observatory of Carleton college |