146 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1951 



Dient, university, and other libraries throughout the country to which 

 1,493 books and periodicals were sent as interlibrary loans. 



The library, in turn, borrowed 1,398 books from the Library of 

 Congress, many of which were Smithsonian Deposit copies, and 297 

 publications were borrowed from other libraries, chiefly from the 

 Geological Survey, the Department of Agriculture, and the Army 

 Medical Library. 



Overcrowding and understaffing continue to be the library's most 

 serious unsolved problems. To find shelf room for new books in 

 stacks, branches, and sectional libraries already taxed beyond their 

 normal capacity requires continuous contrivance of makeshift arrange- 

 ments and rearrangements. 



SUMMARIZED STATISTICS 



Accessions 



Total recorded 



volumes 

 Vohimes June SO, 1951 



Astrophysical Observatory (including Radiation and 



Organisms) 248 13,821 



Bureau of American Ethnology 123 34,961 



National Air Museum 84 210 



National Collection of Fine Arts 280 12,455 



National Museum 3,430 249,831 



National Zoological Park 3 4, 199 



Smithsonian Deposit at the Library of Congress 1,195 583,475 



Smithsonian Office 340 33,788 



Total 5,703 932,740 



Neither incomplete volumes of serial publications, nor separates 

 and reprints from serial publications are included in these figures. 



Exchanges 



New exchanges arranged 465 



178 of these were assigned to the Smithsonian Deposit in the Library 

 of Congress. 



Specially requested publications received 8,227 



991 of these were obtained to fill gaps in Smithsonian Deposit sets. 



Cataloging 



Volumes and pamphlets cataloged 6,992 



Cards added to catalogs and shelflists 29,981 



Periodicals 

 Periodical parts entered 17, 854 



Circulation 



Loans of books and periodicals 11, 869 



Circulation of books and periodicals in the sectional libraries of the 

 Museum is not counted except in the Division of Insects. 



