For anyone out there working on a similar project here is a list of websites we are finding useful:
LibraryWorld: We are using this web-based library automation service to catalog and store all of our records.
WorldCat: Very helpful in locating records not available in LibraryWorld and in finding the correct spelling for foreign-language titles, also helpful for call numbers.
Roman Numerals Calculator: I only know x, i, and v.
Library of Congress class schedules: good for checking call numbers.
OCLC Bibliographic Formats and Standards: What field should I use?
Google Translate: While not really necessary, this site has a virtual keyboard that can be helpful with diacritics. Plus it is really fun when computers say things in foreign languages.