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Significance of Drafts in Steam-boiler Practice, by Walter T. Ray and Henry Kreisinger. [U.S. Geological Survey Bulletin 367.].

Henry KreisingerUnited States. Congress. HouseWalter T. Ray

出版	U.S. Government Printing Office, 1909
URL	http://books.google.com.hk/books?id=UipbQwAACAAJ&hl=&source=gbs_api