The Campbell-Johnston Collection is a collection of poster stamps that forms part of the British Library Philatelic Collections. It consists of 30 large green albums.Martin, Jeremy, & John Powell. (2010) West Africa in the British Library Philatelic Collections. Dronfield: West Africa Study Circle. p. 117.
References
Further reading Schmidt, Walter., ed. "The Poster Stamp Report" in The Cinderella Philatelist, Journal of The Cinderella Stamp Club. Steele, H. Thomas. Lick 'em, Stick 'em; the Lost Art of Poster Stamps. New York: Abbeville Press, 1989.
External links Cinderellas - Poster Stamps article. World Poster Stamps by Charles Kiddle.