Several years ago I came across the citation to an item in the American Philatelic Society's library titled "Study of omissions made in the last revision of Scott's International Postage Stamp Album. Part 1 1840-1940" by Arthur J. Palmer, Jr. I finally got around to borrowing a copy and it is a very interesting document.
What Mr. Palmer did was to give the APS a copy of his 1982 study which "systematically reviewed the 1840-1940 volume and identified what has been left out which would frustrate the average collector." His purpose was to bring the omissions to the attention of the Scott Publishing Company in the hopes that they would address the issues in the next revision of the volume. In 1988, Scott Publishing indicated to him that the then "Part 1-A and Part 1-B" [were to be] extensively re-edited when they have completed reprinting the Specialty Series that was ignored for so many years before sale of the company to Amos Press..."
Mr. Palmer indicated that the "lack of provision of very common issues...[was] mainly the result of the last revision when an attempt was made to provide for the matching of pages with Part II." Cognizant that Scott could not economically be expected to make wholesale revisions, his suggested corrections tried to minimize "re-editing of existing pages."
His minimum recommendation would require 39 new pages, 12 of which would replace blank pages in the album. This would restore 75% of the missing issues. To achieve 89% coverage would require an additional 15 additional pages. One hundred percent coverage would require 40 additional pages.
Mr. Palmer developed a precise and objective set of rules for determining which stamps would belong, the gist of which was to identify missing low value stamps rather than make decisions based on popularity, aesthetics, or similar subjective criteria.
One interesting part of Mr. Palmer's report is his opinions on what had happened in the revision that I assume occurred in the 1970s. He believed that in order to provide continuity between volume 1 and volume 2 that the editors "left out much material," with "back of the book" material, regional and occupation issues, and even regular/commemorative stamps of the 1930s bearing the brunt--i.e., pre-1930 regular and commemorative issues remained largely untouched. Also, he felt that the Scott catalog then current was more fragmented than it is now, particularly regarding definitive issues that were frequently reissued in different colors and denominations...sometimes covering two or more decades." This results in issues that appear together in recent versions of the catalog but are split over multiple pages in the International. Finally, he noted that there were problems with inaccuracies, some of which were natural consequences of changes in the underlying Scott catalog. Others could have been avoided such as correct use of terms like "overprinted" and "surcharged." Finally, he noted that chronological order tends to suffer more in the later editions.
One comment he made I wish I better understood: If Scott were to follow his suggestions, "the added pages will cover a very high percentage of the material that was left out from the last major revision in the 1950's." My 1969 version has copyright dates of 1955, 1965 and 1969 but I currently have no way of determining what changed with each of these revisions except that the countries below identified as left out of the last revision are still in the 1969 edition, albeit out of strict alphabetical order. So, again, I think he is talking about a revision that occurred in the seventies.
The majority of Mr. Palmer's's study is concerned with identifying specific stamps to put into the new version. Here is a summary of the largest lacuna (there are many less numerous omissions not included below):
Argentina--missing 207 official stamps for departments
Austria--missing 30 WW I Military stamps
Benin--entire country left out at last revision
China--missing 88 stamps from Sechwan and other provinces
Cilicia--entire country missing (I assume that Cilicia and similarly designated countries below were never in any Scott International "Blue" edition although they are listed in Scott's catalog)
Cochin China--entire country left out at last revision
Corfu--entire country left out at last revision
Czechoslovakia--many regular issues missing; no newspaper or special delivery stamps; "poor coverage of Bohemia, Morvia, and Slovakia"
Dalmatia--entire country missing
Eastern Rumelia--entire country missing
Eastern Silesia--entire country missing
France--missing 24+ Offices in China - Kwangchowan
Hungary--missing 73 Occupation stamps
India--Mr. Parker would like to see "real" spaces for Convention and Feudatory states (several hundred stamps)
Iraq--missing 49 official stamps 1923-
Moheli--entire country left out at last revision
Obock--entire country left out at last revision
Paraguay--missing 44 regular issues between 1910 and 1938
Persia--missing 67 regular issues 1917-
Philippines--missing 24 official stamp
Poland--missing many common values
Rio de Oro--entire country left out at last revision
Romania--"substantial number of color changes and values missing for the regular issues"; 50 missing postage due and official stamps
Russia--43 stamps from offices in the Turkish empire
South Russia--entire country missing
Tobago--entire country left out at last revision
Turkey--missing 92 regular issues; 39 newspaper stamps