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MLA

Humfredo Marcano-Vega, and United States. Forest Service. Southern Research Station. "Forests of Puerto Rico, 2014." , online. Print

APA

Humfredo Marcano-Vega, H. Marcano-Vega, & United States. Forest Service. Southern Research Station, U. States. Forest Service. Southern Research Station. (0000). Forests of Puerto Rico, 2014.

Chicago

Humfredo Marcano-Vega, and United States. Forest Service. Southern Research Station. "Forests of Puerto Rico, 2014" (2017): online.