Look at the bibliographies, footnotes and reference lists in the articles, books, and reference sources you have already found!
These will lead you to other relevant sources, both secondary and primary sources. Then, search for the article or book in Knox Primo to see if it is available. Use Tipasa to obtain articles not available in full text in Knox Primo.
America: History & Life is a database focusing on the history and culture of North American places covering prehistory to the present. The database includes citations, from the early 20th century to the present, to articles in history journals and other allied social sciences disciplines as they relate to the study of history. It indexes both peer-reviewed articles and articles from popular history journals.
It is often difficult to tell from the database record if an article is peer-reviewed, but look for two things:
If there is no full text available, click on Access Options, then the Find It link to see if the article is available somewhere else in full text, or to request the article via interlibrary loan.
Other databases that cover scholarly journal literterature that may be relevant for some topics about the CRM are:
Non-fiction books in library catalogs like Knox Primo are assigned subject headings. This practice allows books to be grouped together by topic, and also tells you what the books are about.
When you find a relevant book in Knox Primo, look at the subject headings. All the subject headings are links, and if you click on one of them you will see all the other books in Knox Primo that also use that subject heading.