Alaska-Yukon-Pacific Exposition  - Images of the Fair
Examples of A. J. Park and "S" photography
The type of A.J. Park studio-prop photo postcard most commonly seen. (more images below)
Stamped "MADE BY A.J. PARK, SEATTLE WASH.", this scarce photo postcard shows unusual material - participants in Swedish Day. (another image follows below).
An example of the "S" series. Other similar cards show variations in the title font, and do not have the "S". Whether they are associated with the Park studio or not  is a matter of conjecture, but they form a sizable body of interesting work. It must be emphasized that there are many other published and personal photographic postcards, some with titles, some without - putting a photo into this group is a matter of a certain amount of guesswork.