Williams, L.N.
Fundamentals of Philately - Section 2 - US American Philatelic Society
9780933580138
Printing Problems and Varieties|Printing Characteristics|Intaglio Printing|
Fundamentals of Philately - Section 2 - US American Philatelic Society
9780933580138
Printing Problems and Varieties|Printing Characteristics|Intaglio Printing|