Works needed for research by the M.S.U. community that M.S.U. Libraries do not own can sometimes be borrowed from other libraries via interlibrary loan. Be aware that rare books are not usually lent in this way.
Library of Congress catalog. The old printed National Union Catalog Pre-56 Imprints and succeeding volume are in Consulting Reference. Main entry (author or title) and subject access.
British Library Catalogues. The old printed British Museum/Library Catalogue volumes are in Consulting Reference. Main entry (author or title) and subject access.
Bodleian Libraries Catalogue. University of Oxford.
Bibliotheque Nationale de France Catalogue Gallica is their digital library. The old printed Bibliotheque National de France catalogues are in Remote Storage Z 2161 .A26 to .A37.
Center for Research Libraries' Catalogue CRL is a library for libraries to which M.S.U. Libraries belongs. It has much primary source material in microformat that can be borrowed through interlibrary loan.
HathiTrust Digital Library Catalog. Contains full texts of works that are out of copyright that were digitized by the Google Books Project from Big Ten and other major United States academic libraries. Limited view only of works still in copyright. This link takes you to MSU Libraries' catalog entry for it, where you choose whether to search in the HT digital catalog. If the work you want is there, there will be links its entry to view full texts if the work is out of copyright. You can also search across the whole digital full text corpus for words within the works.
ALA ACRL European Studies Section. European Library Catalogs and Archives.
Part of a website created and maintained by American academic librarians who "do" European studies. Has links to general sites and to libraries' sites in particular European countries.