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WikiPedia: Puerto Rico http://money.cnn.com/pf/features/lists/state_unemp... http://www.fullbooks.com/The-History-of-Puerto-Ric... http://www.gdb-pur.com/economy/factsheet/documents... http://www.lexjuris.com/lexprcont.htm http://www.solboricua.com/history2.htm#usa http://www.yale.edu/lawweb/avalon/diplomacy/spain/... http://www.census.gov/prod/2012pubs/acsbr11-02.pdf http://earthquake.usgs.gov/regional/world/puerto_r... http://erg.usgs.gov/isb/pubs/booklets/elvadist/elv... http://bigstory.ap.org/article/puerto-rico-votes-u...