By Butler, Pierce.
Chicago University of Chicago Press 1940 .
xv, 155 p.

By Butler, Pierce.
Boston Gregg Press 1943 .
x, 366 p. , Reprint of the ed. published by the University of Chicago Press, Chicago, which was issued as Papers presented before the Library Institute at the University of Chicago, June 29 to July 10, 1942, and as The University of Chicago studies in library science. 24 cm..