00467nam a2200181I 4500 634718 19860325170921.0 730601|1922||||||| |||| ||eng|u 22013210 KSU NED NEDC QD463 .A8 Aston, Francis William, 1877-1945. Isotopes, by F. W. Aston. London, E. Arnold & co., 1922. viii, 152 p. illus. 22 cm. Isotopes. 0000634718