By Harrison, G. B..
New York Oxford University Press 1951 .
277 p.

By Jackson, Stanley.
London Odhams Press 1951 .
239 p. 22 cm..

By Monaghan, Jay.
Boston Little, Brown and Company 1951 .
xi, 353 p.

By Spring, Howard.
New York Harper 1951 .
550 p. 22 cm..

By Robinson, Kenneth.
New York Macmillan 1951 .
348 p. 22 cm..

By Abro, A. d'..
New York] Dover Publications 1951 .
2 v. (ix, 982 p.) , "Formerly titled 'Decline of mechanism.'" 21 cm..

By Bonn, John Louis.
Garden City, N.Y. Doubleday 1951 .
276 p. 21 cm..

By Butterfield, Herbert.
New York Macmillan 1951 .
254 p. 21 cm..