Human mechanics: Four monographs abridged. W. Braune and O. Fischer, Center of gravity of the human body; O. Fischer, Theoretical fundamentals for a mechanics of living bodies; J. Amar, The human motor; and W. T. Dempster, Space requirements of the seated operator. Technical Documentary Report no. AMRL-TDR-63-123, December, 1963. Prepared under Contract no. AF33 (616)-8091. By Wilton Marion Krogman and Francis E. Johnston, Graduate School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania