Sparks, Joseph, 1896-1975, Federal Art Project (Mich.), and United States. Works Progress Administration., “Pine Tree in Michigan index,” Digital Collections, accessed April 19, 2025, https://digitalcollections.library.gvsu.edu/document/25021.
The Pine Tree in Michigan depicts the drama of Michigan's pine woods in twenty-four block prints carved by the artist from his original sketches. Block print "index to block print illustrations."