Worldwide Registration Label Catalog:
The Registration Label catalog is out of print and is no longer available.
Milt Keiles, Publications Manager

Worldwide Customs Declaration
Label Catalog:
It has 252 pages and covers 119 countries published by Peter Morgen

World wide Airmail Label Catalog:
The Mair Airmail Label Catalog is currently under revision. Completed sections are available from Gunter Mair.
Gunter Mair Publications Editor

World wide Priority Label Catalog:
The Priority Label Catalog is under way.
Neville Ritche Publications Editor

Express Labels of the World Catalog
It has 247 pages and is fully illustrated. It is  available from the publisher Jan C. ter Welle