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Steam engine indicators and valve gears.

APA Citation

Ludy, L. V., American Technical Society. (1918). Steam engine indicators and valve gears. Chicago: American technical society.

Ludy, Llewellyn V., 1875-, and American Technical Society. Steam Engine Indicators And Valve Gears. Chicago: American technical society, 1918.

Warning: These citations may not always be complete (especially for serials).