AGSL Classification System Main Subject Division (A-M)
Geology map of Milwaukee 893-d .M54 G-2002
(893 is Wisconsin, d is for city, .M54 is the amplification (cutter) for Milwaukee, G is the main subject division for geology and 2002 is the date of the map)
Maps representing relief, bathymetry, geomorphology, glaciology, functional regions, general city plans, physiographic regions, geothermal resources, tourist maps.
B (Historical – Political)
Maps showing political divisions, administrative, historical sites, archaeology, explorations, outline maps, planimetric.
Map representing vital statistics and other activities related to population, census, disease, ethnology, tribes, culture, education, religion, sanitation, anthropology, languages, native American reservations, settlements, concentration camps, health resorts.
D (Transportation and Communications)
Maps showing roads, airways, railways, and other types of transportation. Also maps showing other media of communication such as television, radio, telephone, radar, postal lines, harbors, volume and density of traffic, trade routes, Portolons and navigations charts and zip codes.
Maps dealing with natural resources, minerals, forestry, fishing, thermal energy, recreation areas, national parks, conservation, agriculture, vegetation, land use, land tenure, trade, finance, production, consumption, city growth and planning, hotels, functional regions.
Maps showing earthquakes, seismology, volcanoes, terrestrial magnetism, radiation.
Maps showing general geology, tectonics, soils, paleogeography, petrology, hydrogeology.
Maps showing water, its composition, distribution, and use, lake and ocean currents, reservoirs, dams, aqueducts, canals, irrigation.
I (Meteorology and Climatology)
Maps showing distribution of climates, temperature, precipitation, winds, hurricanes, barometric pressure, eclipses.
J (Mathematical Geography)
Mathematical geography, projections, time zones, surveys, mapping, globes gores, aerial photography.
Maps showing the position of planets and stars, extraterrestrial exploration.
Maps showing distribution of animals, insects, fish, and their diseases.
Pictorial maps, cartoons, advertisements, treasure maps, tapestry, block diagrams, bird’s eye views.