TY  - BOOK
AU  - National academy of sciences
TI  - Proceedings of the national academy of sciences of the United States of America
T2  - 47
U1  - 500 
PY  - 1961///
PB  - National academy of science, washington
KW  - Proceedings
KW  - National Academy of Sciences--USA | PNAS--Periodicals
N1  - 601 18.11.61 & 686 14.03.67; Multidisciplinary Science; USA; National Academy of Sciences; Research
ER  -