RT Journal Article SR Electronic T1 Prichiny Vymiraniya Organizmov. (Causes of Extinctions of Organisms.) L. Sh. Davitashvili. Izdatelstvo Nauka, Moscow, 1969. 440 pp., illus. 2 R JF Science JO Science FD American Association for the Advancement of Science SP 273 OP 274 DO 10.1126/science.167.3916.273-a VO 167 IS 3916 A1 Olson, Everett C. YR 1970 UL http://science.sciencemag.org/content/167/3916/273.2.abstract AB