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BooksErrors,Freaks and Oddities on U. S. Stamps - Questions Marks in Philately, by Dr. Stanley B. Segal
Perhaps the first book focusing on EFOs, Dr. Segal's work helped bring EFOs into the mainstream of philately. We present here a complete reproduction of the book.
Papers, ArticlesErrors, Freaks and Oddities, by John Hotchner
In this authoritative essay, Hotchner provides a classification of all EFOs, reviews how they occur and how much they might be worth. This article was originally published in 2000 in the Millenium Edition of Linn's World Stamp Almanac, 6th edition.
John Hotchner's Columns from Linn's
A collection of columns John Hotchner wrote for Linn's from 1978 through 1986.
The AG Files, by Ed Silver
A series of EFO articles published between 1977 and 1983.
Articles by Wayne Youngblood
Articles by John Ryskamp on computer-vended postage.
Articles by Ken Lawrence
Other EFO-Related Articles
ExhibitsExhibit on U.S. postal card errors by William Weiss.
Exhibit on forgeries by John M. Hotchner, Joann Lenz and Richard Drews.
Exhibit on U.S. bicolor postage issues of 1869, 1873 & 1901 by Don David Price.
THE JENNY - Production Variations of America's First Airmail Stamp by Don David Price.
WebSitesInteresting EFO Related Sites (Non-Commercial)
Interesting EFO Related Sites (Commercial)
Other Interesting Philatelic Sites
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