6.001   Trevino F., J. C.  1983.  Status of the Mexican wolf and grizzly bear in
        northern Mexico.  Pages 78-80 in Wildlife and Range Research Needs in Northern
        Mexico and Southwestern U.S.; General Technical, WO-36.  U.S. Department
        of Agriculture, Forest Service, Washington.
              MC 84-18472     WR 199:178      ZR 120(19):8292

6.002   Villa Ramirez, B.  1977.  Major game and their habitats in the Chihuahuan
        Desert.  Pages 155-161 in Transactions of the Symposium on the Biological
        Resources in the Chihuahua Desert Region, United States and Mexico (R. H. Wauer
        and D. H. Riskind, ed.).  U. S. National Park Service, Washington.
               ZR 116(19):6792

see also the following entries: 1.004, 7.006, 11.080, 17.003, 21.110