Laboratory directions in general zoölogy / Winterton C. Curtis [and] Mary J. Guthrie. Curtis, Winterton C. (Winterton Conway), 1875-1965. Guthrie, Mary Jane, 1895- jt. aut. Zoology Laboratory manuals QL53 .C8 1948 591 CUT New York : Wiley, 1948. 1948. 1948 Text viii, 236 p. : eng