In 1955 William Gaines started reprint material from the MAD magazines in black / white paperbacks. The first ever published MAD paperback was 'The MAD Reader', cover art by Norman Mingo.
Some of the US paperbacks have also Canadian or United Kingdom printings:
The MAD Reader: 11th Canadian, 14th Canadian, 17th Canadian
The Bedside MAD: Signet 1st Canadian, 2nd Canadian, 18th UK, 22nd Canadian
The Organization MAD: Signet 1st Canadian, 10th UK
Like, MAD: Signet 11th UK
MAD Ides: Signet 1st Canadian, 6th UK
Fighting MAD: Signet 1st Canadian, 2nd Canadian, 7th UK
The MAD Frontier: Signet 2nd Canadian, 6th UK
MAD in Orbit: Sig 1st Canadian, 5th UK
The Voodoo MAD: Signet 3rd UK
The Greasy MAD: Signet 3rd UK
Three Ring MAD: Signet 1st Canadian, 3rd UK
The MAD Sampler: Signet 1st UK
A MAD World, World, World World: Signet 1st UK
Raving MAD: Signet 1st UK
Boiling MAD: Signet 1st UK
The Questionable MAD: Signet 1st UK
Polyunsaturated MAD: 1st Canadian
Hooked on MAD: 1st UK
MAD for Kicks: 3rd UK
Sergio Aragones's MAD Marginals!: UK 2nd printing
Dave Berg Looks, Listens, & Laughs: Purple Lettering UK 2nd printing
A MAD Guide to Leisure Time: UK
MAD Around the World: Blue/White Lettering UK 2nd printing
Get Stuffed with MAD: UK 2nd printing
MAD's Bizarre Bazaar: UK 3rd printing
MAD's Don Martin Grinds Ahead: UK
The MAD Worry Book: Red Cover with Bluish Green/White Lettering UK 3rd printing
MAD Clobbers the Classics: UK
MAD as a Hatter: UK
The Sound of MAD: UK
A MAD Guide to Self-Improvement: UK
A MAD Guide to Fraud and Deception: UK
The MAD Book of Revenge: UK
Any help and additional information on this list is highly appreciated!