The UChicago Library's Map Collection has more than 900 maps available to view online and download.
The Oriental Institute has many scanned maps available to view and download.
These types of maps are common in the UChicago collection, and using these as keywords may help narrow search results:
Political: shows government administrative boundaries such as countries, states, and counties
Ethnographic: thematic maps that show spatial distribution of human diversity and culture
Geologic: shows rock units, strata, and other structural features studied in geology
Topographic: visualizes landforms, terrain, and other ground features of an area using contours and relief, usually comes in series
Aerial photography: photographs taken from an elevated place such as a plane, drone, or satellite
A map's scale is used to depict the relationship between the map and the real world.
If a map scale is 1:10,000, then one inch on the map may represent one mile on the ground. Scales for urban maps range from 1:1,000 to 1:50,000. Scales for regional maps range between 1:50,000 and 1:1,000,000.
A map's projection is the 2D representation of the 3D globe.
Many types of projections exist, and a cartographer chooses one depending on what it is important to preserve in a map such as distance, area, shape, direction, or scale.
Map sets or series refer to a group of maps that depict small parts of a region, but when these maps are laid together the sheets can be used to show an entire region.
To find out what is available in a set, you must consult an index map. Topographic, aerial, and geologic map sets are most common.
An atlas is a bound collection of maps. Atlases may also contain statistics related to the region it depicts.
A gazetteer is like a dictionary for maps and geographic areas. Consult a gazetteer when searching for maps to find precise names for places, geographical features, historic places, or regional statistics.