To be more specific about what I'm looking for:
Ar 68 losses in frontline squadrons for September to December 1939.
Williamson Murray's book 'Luftwaffe, Strategy for Defeat 1933-45' states that on 4/5/40 there were 241 planes in coastal squadrons. Between May and September 1940 58 coastal planes were lost due to enemy action and a further 62 were destroyed not due to enemy action. I have found details of Do 18 and Do 26 losses in this website
http://histaviation.com/Dornier.html. I am looking for similar details for other coastal types, including the Ar 196 for the period May to September 1940.
Thanks,
Neil