I'll do another shameless plug of my bookstore (if you knew how many hundreds of hours I've put into my bookstore, you'd understand).
Realize that purchases made in the bookstore help support the Forum.
You can find a book on DeCamp on my bookstore page here:
http://fineartbooks.com/history-bostonschool.htm
There's one book just on him and he's also featured in the Boston Painters book.