PNC's on cover
By: by Robert M. Washburn.
Publisher: R.M. Washburn
Published: 1990
Place of publication: [Skowhegan, Me.] (P.O. Box 840, Skowhegan 04976)
Language: eng
Number of pages: 33
Subjects: Coil stamps -- United States.; Covers (Philately) -- United States.
Notes: Includes bibliographical references.