Data sets were provided by the United States Department of Agriculture, Agricultural Research Service, Jornada Experimental Range. Funding for these data was provided by the USDA and the National Science Foundation (Grant DEB-94-11971).
Kris Havstad
USDA Jornada Experimental Range
Dept. 3JER, Box 30001
Las Cruces, NM 88003
Department of Biology
Dept. 3AF, Box 30001
New Mexico State University
Las Cruces, NM 88003-0001