The Natural Resources Conservation Service has created a set of powerpoints for general information about the following topics:

Rangeland Management Range plants - grasses Juniper control
Range health & trend Range plants - forbs Mesquite control
Rangeland hydrology Range plants - woody Prickly pear & cholla
Inventory & Monitoring   Sand sage control
Grazing systems Salt cedar info Shinnery oak control
Ecological sites Invasive plants info Yucca control
     

Some materials I have gathered from other sources to help supplement your information base are as follows:

Lesser prairie chicken Food Security Act of 1985 RWFM Management notes
livestock vs. wildlife management