Search.usa.gov gets 7 hits for: wikileaks "public libraries" , 39 for: wikileaks "public library" , 16 for wikileaks libraries filters , and 12 for wikileaks libraries filter. Search.usa.gov does include many STATE as well as federal sites and documents, but it still pays to try individual states. Maryland.gov gets only 3 hits for the search : wikileaks, that barely mention it, but www.ca.gov gets about 8 results, and www.ny.gov gets 10.
In addition to these "official" sites, it's well worth trying Google searches limiting to edu sites; or even adding the phrase "k 12" to get public school sites. The search: wikileaks "public library" filters site:edu gets 105 actual hits (of "about 9890" ); wikileaks policy "public library" site:us displays 177 (of "about 130,000) ; wikileaks "school library" "library policies" "k 12" gets 10.
There has been too little time for many journal articles to get published on this topic. Newspaper articles may help, of course. LexisNexis Academic (available at most large academic libraries) gets 237 articles for wikileaks and libraries, when you click "NEWS", then "US Newspapers and wires". This big list is manageable if you change the title list to "Expanded List" -- to see the search words in context and hot-linked. Factiva, known as a business database, is also very good for general news. It gets 58 hits for wikileaks and libraries, limiting to "past year". It automatically gives search words in context - but not hot linked. But LexisNexis "US Legal"/"Law Reviews" is far less promising. The search: wikileaks w/40 libraries (to get the words within 40 words of each other in those LONG articles) gets only 7 hits, and most seem to be about Library of Congress.