537,235 ADVANCES Advances in comparative leukemia research. Proceedings of the IXth International Symposium on Comparative Research on Leukemia and Related Diseases, held in Pitsunda, U. S.s.R. on 3—6 October, 1979. Ed—s: David S. Yohn, Doris A. Lapin, James R. Blakeslee New York 1980 Elsevier/Horth-Holland 8° s. XLVII, nlb. 3, 567, ,il.