Jim,
Two more recommended resources for the French and Belgian campaigns, both by Pierre Watteeuw:
- Avions Hors Serie No.10 "Les pertes de la chasse de jour allemande en France, Vol. 1: Sep 1939 - Dec 1940", Editions Lela Presse, ISBN 2-914017-14-6
- "Les pertes de la chasse allemande de jour en Belgique, tome 1: 1940-1942", De Krijger
FYI, also available is Avions Hors Serie No.15, which is the follow-up to No.10 above. It covers 1941.
Leon Venter