01029cam a22003011 4500 6913445 BD-DhUL 20141120104545.0 760804s1941 xx 000 0 eng 41010594 (OCoLC)2354280 DLC OTU OCoLC DLC BD-DhUL premarc QH308.5 .R5 574 RIB Ritchie, John W. (John Woodside), 1871-1943. Biology and human affairs / John W. Ritchie. Yonkers-on-Hudson, N.Y. : World book, c1941. xiv, 1026 p. : ill. (incl. ports.) ; 23 cm. At head of title: By John W. Ritchie. Includes bibliographical references and index. Biology. Day, Chapin Walker. Studies and activities in biology. Ritchie, Margaret. Studies and activities in biology. Studies and activities in biology. 7 cbc oclcrpl u ncip 19 y-gencatlg ddc BK 19975 19975 0 0 ddc 0 574_000000000000000_RIB 0 NFIC 38157 DUSL DUSL GEN 1956-02-07 purchased 574 RIB 86907 2014-11-20 2014-11-20 BK