na INLIS000000000003297 20210519133622 210519||||||||| | ||| |||| || | 010-0521003297 en 636.083/NIC/l 636.083/NIC/l J.E. Nichols Livestock Improvement: in relatioin to heredity and environment 4 [SL] The iowa state collage press 1957 IX, 240 p.: ill.; ref. 22 cm + Indexs LIVESTOCK -- INVIRONMENT -- PROGENY TEST