Guide to Federal Records in the National Archives of the United States1995 Print Version available in :
US Docs, Geisel Floor2 West AE 1.108:G 94 (3 vol.)
The index to this guide is very helpful in identifying relevant collections in microfilm and other formats which can be used at the Archives themselves, or, in many cases, at other libraries. UCSD holds some of these and many others can borrowed through inter-library loan. Such holdings include copies of many collections from foreign archives.