If MSU does not have something you would like to use for your research, you can request it through Interlibrary Loan, if it is available through a partnering institution.
CAMP is a CRL project that MSU Libraries participates in as a donor and borrower. CAMP can be a great source for microfilm materials not held by MSU, and they can be requested through Interlibrary Loan.
Increasingly, materials are available freely online through various institutions. The list below is by no means comprehensive, but rather just provides a few examples. More detailed results can be found on various research guides (and course guides), and we are always happy to help you search further on your topic!