This program is made to import an ADIF and lookup information that you
may need to add to the log entry. While it was not made for Fldigi,
it may very well work with the logbook. I don't contest so I haven't
tried it myself. I would be interested in hearing if it is useful.
Link is:

http://www.ko4bb.com/ham_radio/ADIFLookup/

It's free and the author works where I do, so I know he keeps the
program updated. He also keeps a massive collection of manuals.

Rich
WA4SXZ