Letter from Rivera to Pflueger (undated)
In this letter, Rivera expresses his interest in Pflueger's "proposition."

 Letter from Rivera to Pflueger (April 15, 1940)
Rivera's acceptance of Pflueger's invitation to participate in the GGIE and paint a fresco.

 Agreement between Rivera and Pflueger (April 15, 1940)
Signed by Rivera and Pflueger, this agreement outlines the scope of the mural project, including size, cost, and subject matter.

 Letter from Rivera to Pflueger (undated)
Rivera discloses his need to leave Mexico City as soon as possible.
Courtesy of John Pflueger, Architect