Puerto Rico

• Russell Gurnee, Jeanne Gurnee (1973): Discovery At The Rio Camuy,
  The finding and exploring of one of the largest caves in the Western world. A very readable an exciting account of cave exploration in Puerto Rico.
  HB DW 183 pp illus.
• W Munroe (1976): The Karst of Puerto Rico, US Geol Survey Prof Paper, 1976, 69 pp. [not seen]
• Ariel E Lugo et al (2001): Puerto Rican Karst - A Vital Resource, United Department of Agriculture, Forest Service. Gen Tech Report WO-65. August 2001 99 pp illus. SB