Croll, J. G. A. Force systems and equilibrium / J. G. A. Croll. - London : Chatto and Windus, 1974. - Modular textbooks in engineering . Includes index. ISBN: L.1.25 LCCN: 75327633 Nat. Bib. No.: GB74-23380 Subjects--Topical Terms: Force and energy.Equilibrium. LC Class. No.: QC73 / .C92 Dewey Class. No.: 620.1/03