National Academy of Sciences of the United States of America <br/><br/>
Proceedings National Academy of Sciences of the United States of America. Vol 57(1967) - 89(1992) 

 - Washington D.C.  National Academy of Sciences of the United States of America  1967 
 - 356p 
<br/><br/>National Academy of Sciences of the United States of America: Proceedings National Academy of Sciences of the United States of America. Vol 57(1967) - 89(1992).  Washington D.C..  National Academy of Sciences of the United States of America, 1967.--(506NA 
<br/><br/><br/>ENGLISH 
<br/><br/><label>Dewey Class. No.: </label>506  / PNAS