1. Climatology of Atlantic tropical storms and hurricanes;Alaka,1976
2. Research history and opportunities in Luquillo Experimental Forest;Brown;U.S. Dept. Agr. For. Ser., Gen. Tech. Rep., SO-44,1983
3. Report on the Rehabilitation of Rio Blanco Hydroelectric Project for Puerto Rico Electric Basin Authority;Dames and Moore, Inc.;Job No. 11905-002-14,1980
4. Rapids in canyon rivers;Graf;J. Geol.,1979
5. Preliminary map showing landslides in El Yunque quadrangle, Puerto Rico;Guariguata;U.S. Geol. Surv. Open-file Rep. 89-257,1990