Library of Congress Historical Conservation and Environment Maps
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https://cmr.earthdata.nasa.gov/search/concepts/C1214614266-SCIOPS.html
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资源简介：
The historic and more recent maps contained in the Conservation and Environment
category show early exploration and subsequent land use in various areas of the
United States. These maps show the changes in the landscape, including natural
and man-made features, recreational and wilderness areas, geology, topography,
wetland area, vegetation, and wildlife. Specific conservation projects such as
the growth and development of U.S. National Parks are included in this
category.
[Summary provided by Library of Congress.]
提供机构：
SCIOPS
