Linn began publishing philatelic handbooks including works on Mexican and American philately beginning circa 1910.
This cover commemorated the passing of President Warren G. Harding, and featured the use of the black 2-cent "mourning stamp" (Scott No.
Because of his dedication to advancing the hobby of stamp collecting, he was named to the American Philatelic Society Hall of Fame in 1967.
The ASDA or American Stamp Dealers Association placed Linn in its Hall of Fame in 2013.
Linn's Weekly Stamp News continues to be printed to this day (as of 2017), and subscribers can read it online.