This dataset adapted from the map provided "Biotic Communities of the Southwest", August 1980 by David E. Brown and Charles H. Lowe. The datasest show the distribution general biotic communities across Arizona (i.e. Great Basin Desertscrub, Interior Chaparral, etc.). http://www.canotia.org/volumes/CANOTIA_2007_Vol3_1_Brown_et_al.pdf