Commercial tests and how to use them / by Sherwin Cody.

Yonkers-on-Hudson, N. Y. : World book company, [1919], ©1919.

vii, 216 pages ; 19 cm.

Includes bibliographic footnotes and index

This edition was reprinted in 1920

Copy 1 Supplier/Donor: Poly E. London Note: 1920 printing. Formerly in the Spearman Collection of the Charles Myers Library at the N.I.I.P