A silkscreen WPA Art Project poster for the Illinois State Library Project circa 1940. View full size. Available as a Juniper Gallery fine-art print.

It's the third Tuesday in September - so it must be Old Poster Day at Shorpy.com! Old Faithful erupts in this circa 1938 National Park Service silkscreen for Yellowstone National Park. View full size. Available as a fine-art print.

Circa 1938 National Park Service silkscreen poster for Fort Marion National Monument. View full size. Available as a Juniper Gallery fine-art print.

Circa 1938 National Park Service silkscreen poster for Grand Canyon National Park. View full size. Available as a Juniper Gallery fine-art print.

Circa 1938 National Park Service silkscreen poster for Zion National Park. View full size. Available as a Juniper Gallery fine-art print.

Circa 1938 National Park Service silkscreen poster for Lassen Volcanic National Park. View full size. Available as a Juniper Gallery fine-art print.

A poster for the Federal Theatre Project presentation of "Gaieties of 1936" at the Greek Open Air Theatre, Vermont Avenue at Griffith Park in Los Angeles. View full size

From 1937 comes this silkscreen Federal Art Project poster warning of the consequences of vandalism. Work Projects Administration Poster Collection.

1938 WPA silkscreen poster promoting oral hygiene. Artist unknown. Work Projects Administration Poster Collection. Now available as a print!

Circa 1942 silkscreen poster by Louis Hirshman encouraging safe disposal of matches, showing stylized Japanese soldier standing behind a tree with a match, with the rising sun in the background. Federal Art Project / WPA War Services Project. View full size.

A poster for the 1939 July 4th celebration at the DuPage County Centennial in Downers Grove, Illinois. View full size