World War II mapping is worldwide for military operations on land, at sea, and in the air, and covers various aspects of the military campaigns from intelligence gathering and planning to execution and historical analysis.
These maps cover many areas of the world, and the mapping continues today under the successor, the Defense Mapping Agency (RG 456).
Prominent among Federal explorers who continued the work of Lewis and Clark were Zebulon M. This body of over 16,000 maps, covering the period 1800-1939, includes items pertaining to Indian treaties, removal policy, reservations, settlements, and land use.
Because of the vast extent of the Indian lands and the great variety of maps compiled or used by the Bureau, this file also contains much incidental information about other aspects of the physical, cultural, and historical geography of the United States.
There were many other expeditions, however, and each made its contribution to filling in the map of the West or providing information about overseas areas considered vital to the interests of the United States. Other records of the General Land Office and its successor, the Bureau of Land Management (RG 49), include general state maps; plats of private land claims, mineral claims, and townsites and maps showing rights-of-way for transportation and communication lines.
The files of the Office of the Chief of Engineers in Record Group (RG) 77 and the Archives File of the Hydrographic Office (RG 37) contain the most important collections of Federal explorers' maps, many of which made major contributions to geographic knowledge. Indian Affairs Maps showing information about the Indians of the United States can be found among the records of many agencies, but the largest concentration is the central map file of the Bureau of Indian Affairs (RG 75).