Fundamentals of Philately by L. N. Williams illustrates a number of different printing processes and has a wealth of other philatelic useful information. The 2nd edition is available from the APS for $60 to non-members and $48.00 to members. The first edition can often be found on E-Bay for less. The first edition has better illustrations and slightly less information. The 2nd edition was produced by copying the photos in the first edition. At this time there is only one copy of the 2nd edition (2008 revised) for $32.50 plus shipping of $6.50.