U.S. Copyright Renewals, 1971 July - December
Chapter 3
CLARK, JOHN A.
Science on the march. Book 3. By John A. Clark, Frederick L. Fitzpatrick & Edith Lillian Smith. © on p. 528-561; 10Apr44; A180023. J. Landon Clark (C); 26Nov71; R517371.
Workbook for Science on the march,