Include keywords for both the geographic region and the type of map (e.g. topographic map, geologic map, road map) you need.
Arizona physical maps
New Mexico topographic maps
Pima County remote sensing maps
Mexico vegetation maps
Finding maps at a particular scale
Map scales are usually given in the catalog as a representative fraction, such as 1:100,000 (see map scale). A map series for a larger area may include the area you are interested in; so be sure to check for maps of larger areas such as countries or continents.