There's Roger Freeman's
The Mighty Eighth War Diary.
Here's a sample page so you can see there is the number of aircraft taking off, that did bomb, claims and losses by units.
For detailled losses (including accidents), there the
Losses of the US 8th and 9th Air Forces serie.
On internet, there's the website of IWM concerning the USAAF in Britain which have an entry for each mission:
https://www.americanairmuseum.com/mission