Steve,
Try this site for the 394th
http://www.ww2buddies.com/BG394.html unit histories were also printed as follow ' The Annihalators 322nd.BG', 'The Crusaders 386thBG', '344th BombGroup', 'The Bridges Busters 394th.BG. There was also a more recent history of the 410th BG but I cannot remember the title. East Anglia Books who advertise in Flypast may be able to help if any of these are available second hand, might be pricey,
Regards
Brian Bines
410th BG history 'Attack Bombers We need You' by Ralph Conte one on amazon