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- Mercado-Díaz, J.A., Gould, W.A., González, G. & Lücking, R. 2015. Lichens in Puerto Rico: An Ecosystem Approach. General Technical Report IITF-GTR-46. pp. i–iv, 1–76. United States Department of Agriculture, Forest Service, International Institute of Tropical Forestry, San Juan. ResearchGate .USDA (PDF)