> I've found this useful at times: > http://www.itsmarc.com/crs/bib1468.htm > > It's apparently not maintained, but lists more fields as "obsolete" > than the "selected" ones on the LC list - probably best to use both > together. For looking up individual fields by number or keyword, http://calculate.alptown.com/ can be handy One thing to be aware of is that use of many fields is highly inconsistent and that a combination of major/minor field extraction and heuristics is often more reliable than relying on field definitions. kyle