Covers all aspects of human impact to the environment, including scholarly, government, and general-interest titles on global warming, green building, pollution, sustainable agriculture, renewable energy, recycling, etc.
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Covers research in the biological and biomedical sciences, including biochemistry, biology, biotechnology, botany, ecology, genetic engineering, genetics, microbiology, and more.
"The National Map is now offering a collection of small-scale datasets that can be downloaded for free...Small-scale maps have an advantage over large-scale maps when there is a need to show a large area in a single view. This makes small-scale maps an ideal solution for scientists, decision-makers, and planners needing to provide a geographical context for the research projects. Generally, certain geographical and feature details found in large-scale maps are limited or omitted in small-scale maps. The choice of small-scale maps always comes down to the intended use of the final map.
The National Map collection of 197 small-scale datasets can be downloaded at small-scale data download page" (home page).