Sparks, Joseph, 1896-1975, Federal Art Project (Mich.), and United States. Works Progress Administration., “Pine Tree in Michigan, lumber barge,” Digital Collections, accessed December 5, 2025, https://digitalcollections.library.gvsu.edu/document/25039.
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 no. 18, listed in index of illustration as "lumber barge."