共 7 条
[1]
Byers J.A., 1997, American pronghorn: social adaptations and the ghosts of predators past
[2]
DUFFIELD WJ, 1996, T 61 N AM WILDL NAT, P285
[4]
Emptying areas of the United States, 1990-1995
[J].
JOURNAL OF GEOGRAPHY,
1998, 97 (03)
:108-122
[5]
Phillips A., 2001, COGRAZING CATTLE CAM
[6]
SCHMIDLY D.J., 2002, Texas natural history: a century of change