Unfortunately, the article's writer erroneously refers to the blog "Big Blue 1840-1940" as "Bud's Big Blue" (apparently he missed the blog's name in the header which can be a bit hard to discern).
The relevant portion of the Linn's article follows:
The most comprehensive single site I found was Bud’s Big Blue 1840-1940. (The big blue refers to the 1969 edition of the Scott International Album, Part I, 1840-1940.)
For more information, scroll down on the left side of the main page and click on Bud’s Big Blue — An Introduction and index.
The site contains scans of a completed edition of Scott’s International Postage Stamp Album, Part 1, 1840-1940. Remarks about most stamps are included, and visitors can post their own comments.
The site also includes monthly calendars with postmarks for all the days of the year. A large stamp image is provided for each date. The postmark for July 2 is shown. The site describes this stamp as “U.S. 1898 Scott R155A 2c pink, Type IV Blue Overprint, ‘Washington’ Revenue Stamp.”
Regardless, our own Jim Jackson deserves our congratulations and admiration for putting together what the author has described as "the most comprehensive single site.