Samuel Pierpont Langley: verschil tussen versies

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*Samuel P. Langley,1890 , The Temperature of the Moon, Memoir of the National Academy of Sciences, vol. iv. 9th mem. 193pp .
*Langley & Abbot, 1900, Annals of the Astrophysical Observatory of the Smithsonian Institution, Volume I
{{Commonscat|Samuel Pierpont Langley}}
 
[[Categorie:Amerikaans astronoom|Langley, Samuel P.]]
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