CLARK, JOHN R. Modern school arithmetic. Grade 3-4. By John R. Clark, Arthur S. Otis & Caroline Hatton. Edited by Raleigh Schorling. New ed. © 1Mar37, A104485; 9Mar37, A104486. John R. Clark, Caroline Hatton Clark (A) & Marlene Otis (W); 25Feb65; R356351-356350.