I'm surprised that long list of Double Gun Books did not include Shotgun Technicana by McIntosh and Trevallion. It's out of print, but well worth reading if you can locate a copy.
I agree its an excellent book - and it
is listed (in the middle of the McIntosh section)
Slightly off topic - there is an excellent shooting bibliography called "Shooting Flying" by Robin Chute. ISBN 0 046053-04 9 published in 2001. It lists 689 shooting books, many rare and historical.
Personal shooting favourites are by Gough Thomas, Peter Hawker (especially the diaries) and Don Zutz. Jonathan Ruffer's "The Big Shots" is also great fun to read.
