Calculating Instruments and Machines, 1949 first edition.
Univ Illinois Press, Urbana, 1949; first edition;.
Univ Illinois Press, Urbana, 1949; first edition;.
Univ of Illinois Press, 1949, second printing 1953; 138 pages, diagrams, photographs.
Princeton University Press 1955, 2nd printing 1957; 201 pages, diagrams.
MTAC, The National Research Council, Wash., D.C., April 1950, pp 61-126.