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Samuel Phillips to Samuel P. Savage Discussing Gun Powder Supplies, 20 August 1780
Samuel Phillips
出版1780
URLhttp://books.google.com.hk/books?id=G_hH0AEACAAJ&hl=&source=gbs_api
註釋Discusses the amount of saltpeter he has left in the refining house, mill, and other buildings. States that the amount of gun powder he can produce weekly is uncertain because it depends on weather and other circumstances.