Economics of fatigue and unrest and the efficiency of labour in English and American industry / by P. Sargant Florence. Florence, P. Sargant (Philip Sargant), 1890-1982. Fatigue. Industrial efficiency. HD4904.5 .F6 338 FLE Printed in Great Britain. "Select list of sources": p. 15-16. London : George Allen, 1924. 1924. 1924 Text 426 p. eng