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Dyfyniad Arddull ChicagoOberg, Erik, Franklin Day Jones, and Holbrook L. Horton. Machinery's Handbook. 22nd ed. New York: Industrial Press, 1959.
Dyfyniad MLAOberg, Erik, et al. Machinery's Handbook. 22nd ed. Industrial Press, 1959.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.