Hi Dave
01-40AL-2 is the Erection and Maintenance Manual for the A-20G
The A-20G pilots manual would be 01-40AL-1 and the A-20C pilot manual is 01-40AD-1. I do not know the manual numbers for the other variants unfortunately
Here are the RAF pilot notes for the Boston and Havoc (the brit designation for their A-20 variants)
Sorry I do not have 01-40AL-1 yet