When you find good material with a Keyword search, look at the Subject Headings to find more. Subject Headings examples:
Ecotourism (note geographic subheadings)
Find books, articles, & more
To find books from a particular publisher at Williams, use ADVANCED FRANCIS. Enter any keyword (or even just an asterisk *) in the top section, and type the publisher's name in the "Publisher" box at the bottom of the page. Some publishers recommended for this class are MIT Press, Earthscan, and Routledge. For Williams WorldCat, search the name of the press by Keyword.