Consider your source. Scholarly articles are excellent sources for a number of reasons, including evidence in the form of citations and references. Academic press books and eBooks also provide evidence.
Subject terms. Civilizations in Collapse, you say? Try incorporating subject terms such as 'collapse' and 'human ecology' (ex., Easter Island AND human ecology).
Dissertations. Dissertations are substantial, well-researched pieces of scholarship -- use the dissertations database to tap into a wealth of resources.
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