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Philately. State College, PA: American Philatelic Society. p. 756. ISBN 0-933580-13-4. "Stamp Perforation: The Somerset House Years 1848 to 1880 (Ray Simpson...12 KB (1,584 words) - 23:01, 20 September 2023
Rev ed. State College, PA: American Philatelic Society. p. 15. ISBN 0-933580-13-4. Hornung (1970), pp. 258 Hornung (1970), pp. 262 Solarz, Sanford (2008-09-18)...10 KB (928 words) - 06:18, 17 April 2023
Publications, 2021) ASIN B091MBTGJ7 (read online) L.N. Williams, Fundamentals of Philately (American Philatelic Society, 1990) ISBN 0-933580-13-4 p. 20 v t e...2 KB (275 words) - 17:04, 9 April 2021- Sources Leon Norman Williams, Fundamentals of Philately (American Philatelic Society, 1990) ISBN 0-933580-13-4 Scott Catalogue Stanley Gibbons catalogue...4 KB (582 words) - 20:28, 15 June 2023
Fundamentals of Philately (American Philatelic Society, 1990) chap. 15 ISBN 0-933580-13-4 Wikimedia Commons has media related to Philately. SCB Digital Perforation...3 KB (335 words) - 06:08, 21 September 2023
Fundamentals of Philately (revised ed.). American Philatelic Society. ISBN 0-933580-13-4.{{cite book}}: CS1 maint: multiple names: authors list (link)...19 KB (2,609 words) - 00:59, 22 March 2024
Fundamentals of Philately, p. 20, American Philatelic Society, 1990 ISBN 0933580134. Pam Price, Cool Stamps, p. 9, ABDO, 2006 ISBN 1599283751. Carlton, R...12 KB (1,347 words) - 12:02, 23 December 2023- (American Philatelic Society, 1990), chap. 13 "Inks and Color" ISBN 0-933580-13-4 Texas Precancel Club's chart of variations seen in stamp color names...7 KB (955 words) - 20:03, 20 January 2024
Leon Norman Williams, Fundamentals of Philately, 1990 page 82 ISBN 0-933580-13-4 R. J. Sutton, The Stamp Collector's Encyclopaedia 1967 page 309 Roland...39 KB (3,673 words) - 16:08, 10 January 2024
