322.png

: There are commercial digital bundles, such as Watercolor Spring Animal Wreaths on Etsy, that contain exactly 322 PNG images.

: Renewals for The Bobbsey Twins at the Ice Carnival under the pseudonym Laura Lee Hope. 322.png

While the Project Gutenberg file is the most likely "paper" or document reference, "322.png" also appears in other contexts: : There are commercial digital bundles, such as

: Renewals for The Mystery of the Flying Express (Hardy Boys series). : There are commercial digital bundles