Material relating to H.M.N.A.O., 1952-1953 and undated
Scope and Contents
Papers regarding methods of comet orbit calculation (158-163); Notes from Porter to D.H. Sadler (164-174).
- 1952-1953 and undated
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- From the Series: Porter, John Guy, 1900 - 1981 (astronomer) (Person)
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