کتاب های Henry Ryffel
Machinery's handbook : a reference book for the mechanical engineer, designer, manufacturing engineer, draftsman, toolmaker, and machinist
Franklin D Jones, Henry H Ryffel, Erik Oberg, Christopher J McCauley, Ricardo M Heald, 2008
Guide to the use of tables and formulas in Machinery's handbook
Amiss, John M.; Jones, Franklin D.; Ryffel, Henry H, 2016
