Proceedings of the National Academy of Sciences of the United States of America. 
Vols. for <1999-> also called:  PNAS 

 - Washington, D.C. :  The Academy,  [1915]- 
 - v. :  ill. 
 - Weekly,  2004- 
 - Monthly,  1915-1981 Semimonthly,  1982-1993 Biweekly,  1994-2003 
 - Vol. 1, no. 1 (Jan. 15, 1915)- 
<br/><br/><label>ISSN: </label>0027-8424 
 = Proceedings of the National Academy of Sciences of the United States of America 
 = Proc. Natl. Acad. Sci. U.S.A. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--Periodicals.