Most library catalogs and some other library database use subject headigns from the Library of Congress. Becoming familiar with the relevant terms will improve your catalog searches, for example, "Human Ecology History" is the main "environmental history" subject heading (there is no "environmental history" subject heading in the library catalog, though some books will come up when you search on it). Be sure to look at the subject headings for any books you find to get ideas for other terms to use.
Agriculture History |
Global Warming |