Poster containing a map color-coded to "denote areas of general similarity in ecosystems and in the type, quality and quantity of environmental resources" with a key to regions and sub-regions in the lower-left corner along with a similar inset for the conterminous United States (scale 1:2,500,000). The poster also includes a list of the regions in Texas with descriptions and illustrative photographs to the right of the map, which is continued on the back. The back of the poster also includes a smaller version of the state map in the lower-left corner along with a list of common and scientific names of native plants and and wildlife, as well as a source list.