This section is curated by the EFOCC webmaster. Each item is briefy described, so that you know what a particular
reference contains before you click on a link.
100 Years of Stamp Production 1894 - 1994
A booklet issued by the Historical Resource Center of the Bureau of Engraving and Printing reprints an article
that appeared in the July 1994 issue of the United States Specialist. It has a lot of information on selected stamp issues
as well as many references for futher study. The details about various printing presses is particularly interesting.
Papers, Articles
Errors, 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.
A two part exhibit hosted by the APS on printing methods, paper types, postage stamp separation methods and EFOs that happen
due to variations in those elements: Part 1 Part 2
The Museum of Philately, maintained by David Feldman Auctioneers, contains many exhibits,
including some with substantial EFO content. The quality of material is excellent. presentation is generally good, but the site is slow. Don't let this turn you
off, waiting for the pages to load will well worth the wait. Even when not EFO-related. the exhibits shown are magnificent. Your webmaster liked in particular:
The rarities page is also fascinating and has information on several well-known
inverts, including the price and date of the last sales as well as the stamps' provenances.