These show the bedrock, surficial, or engineering geology of selected quadrangles in the United States. Accompanied by brief texts. Formerly called Miscellaneous Investigations Maps. Show a variety of geologic and hydrologic topics. Maps of the planets and moons are found here.
Land cover describes the vegetation, water, natural surface, and construction on the land surface.
Features of base maps are boundaries, cities and towns, railroads, roads and highways, rivers, and lakes. Preliminary reports on geologic aspects of mineral and environmental studies. Series, begun in 1950, formerly known as Minerals Investigations Field Studies. Pre-1971 maps show geology related to specific mining or mineral deposit studies. Post-1971 maps cover subjects related to environmental studies or wilderness areas mineral investigations.