A ASCII text file  
B Booklet [5.5 X 8.5 inches, stapled]
B1 Booklet [5.5 X 8.5 inches, square bound, glued]
B2 Booklet [7 X 10 inches, square bound, glued]
B3 Booklet [7 X 8.5 inches, square bound, glued]
C
Comic Book
D Digest    
E
E-Book


H Hardcover    
M Magazine [8.5 X 11 inches, stapled]
M1 Magazine [8 3/8 X 10.75 inches, glued]
M2 Not Used  
M3 Magazine [8.5 X 11 inches, spiral bound]
M4 Magazine [8.5 X 11 inches, clip binder]
M5 Magazine [8.5 X 11 inches, perfect bound]
M6
Magazine [8.25 X 11 inches, perfect bound]
P Paperback    
PDF Adobe Acrobat Portable Document File
T Trade Paperback [various sizes]
T1 Trade Paperback [5.5 X 8 3/8 inches]
T2 Trade Paperback [8.5 X 11 inches]
T3
Trade Paperback [6 X 9 perfect bound]
W Microsoft WORD  
X 4.8 X 6.8 inches, square bound, glued
Y 8 X 5.25 inches, stapled  
Z 8 X 5.50 inches, square bound, glued