Mitchell, S. A. (Samuel Alfred), 1874-1960. The fundamentals of astronomy [microform] / by S.A. Mitchell ... and C.G. Abbot.

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Mitchell, S. A. (Samuel Alfred), 1874-1960.

The fundamentals of astronomy [microform] / by S.A. Mitchell ... and C.G. Abbot.

Astronomy.

1927.

Abbot, C. G. (Charles Greeley), 1872-1973