International Institute of Tropical Forestry
The International Institute of Tropical Forestry is a program of the United States Forest Service that was founded in 1939. It is headquartered in Rio Piedras, Puerto Rico, on the grounds of the University of Puerto Rico's Agricultural Experimental Station. Events on May 20th, 2014 mark the Institute's 75th anniversary. 
- "About the Institute". Fs.fed.us. Retrieved 2014-05-18.
- "Commemorating 75 Years". Fs.fed.us. Retrieved 2014-05-18.
- "US Forest Service Annual Letter 2002-2003, General Technical Report IITF-GTR-31". December 2006.
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