Final answer:
The specific physical landscape where Joe worked in the summer of 1935 is not detailed within the provided text; thus, the main answer can't be conclusively determined from the references given.
Step-by-step explanation:
The physical landscape where Joe worked in the summer of 1935 is not directly mentioned within the given reference information. However, using context clues from the text, the landscape is likely referring to one of the art installations or settings described. From our references, we have a site-specific, permanent sculpture commissioned by Joseph Pulitzer Jr., created by Richard Serra. This sculpture, Joe (7.8.1), is a spiral steel structure contrasting a modern building. We also have mention of Albert Bierstadt's paintings, particularly Rocky Mountain Landscape which is present in the White House, and a description of Robert Smithson's earthwork captured in a photograph by Gianfranco Gorgoni. Furthermore, there's a mention of the painting The Valley, Vacaville illustrating the farmlands before the bay area expansion. Finally, there's reference to My Landscape II, a painting by the American Art Museum, and mention of the painting The Rocky Mountains, Lander's Peak by Bierstadt again. Given that none of these descriptions directly cites the work environment for Joe, it's imperative to obtain more details to accurately determine the landscape in question.