Environmental history is interdisciplinary. So, you may need to search databases for anthropology, ecology, and so on. Either try an interdisciplinary search like LibrarySearch+ or Scopus, or look for a specialized database listed on our subject guides.
The following links lead to Library of Congress subject heading searches in LibrarySearch. These same subject headings can find relevant books in any academic library catalog.
Using the Advanced Search function in LibrarySearch, you can combine any of these with other terms, such as geographic terms like (Maine OR New England OR Atlantic States), or (History), or kinds of sources like (bibliography OR guidebooks) or (correspondence OR diaries)
Though you will probably start with LibrarySearch, don't end there.
For a more expansive list of primary sources, see United States History: Primary Sources. See also Lewiston History for local archives and collections.
See United States History: Primary Sources research guide.