The Ecological life zones of Puerto Rico and the U.S. Virgin Islands 
by J.J. Ewel and J.L. Whitmore. 
 - [Washington]  1973. 
 - 72 p.  illus., graphs, map. (col. inserted), plates tables. 
 - Forest Service research paper ITF .
<br/><br/>Bibliographical references included in "Literature cited." (p. 66-71) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecology--Puerto Rico.<br/>Ecology--Virgin Islands of the United States.
<br/><br/><label>National Agricultural Library Call No.: </label>A99.9  / F7637 No.18A