John W. Ritchie, Elizabeth M. Ritchie & Chapin W. Day.
Biology and human affairs; new edition teacher's manual.
R628043. Biology and human affairs; new edition teacher's manual. By John W. Ritchie, Elizabeth M. Ritchie & Chapin W. Day. NM: revisions. © 15Mar48; AA80572. Elizabeth M. Ritchie & Chapin W. Day (A); 8Mar76; R628043.
Elizabeth M. Ritchie & Chapin W. Day|A