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Digital Collections:
https://www.loc.gov/collections/
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http://www.loc.gov/law/http://www.loc.gov/law/help/guide/states/us-ut.php
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Federal Library Directory (FRD) :
http://loc.gov/flicc/FLD/index_FLD.html
FRD Search:
http://viewshare.org/views/FRD/directory
Available online from the LC. Developed in 2012 as a joint project of the Federal Research Division (FRD) and the Federal Library and Information Network (FEDLINK), the searchable listing provides information about each library, including size and location. Federal libraries range in size and scope and mirror the types of libraries in society: public, school, research, medical, legal, and more. There are primary and secondary school libraries at Department of Defense facilities around the world, as well as branch libraries in national parks, federal prisons, and field offices of federal agencies with a large number of employees and visitors. The EPA, alone, has 28 libraries listed and the there are 74 base libraries with in the U.S. Air Force.