Napp's numbers
By: Joseph M. Napp.
Publisher: J.M. Napp
Published: 1988
Place of publication: West Orange, N.J
Language: eng
Subjects: Plate blocks (Postage stamps) -- United States -- History.; Plate numbers (Postage stamps) -- History.
Table of contents: title: v. 1. A study of the plate number combinations created by the overprinting of U.S. postage stamps for use in the United States possessions and administrative areas, 1899-1946; title: v. 2. The Philippine Islands issues during the American administrative period, 1906-1946.