Summary:
Bel Geddes's prospectus and sketches are for houses with walls that open. Additional material is located in Planning Standards - Houses (job 667), including 16 blueprints, and sketches for Geddes's "Edith," "Locust," and "Small" houses.
For a more detailed description of holdings, see Kristen Noel Brown, House Designs of Norman Bel Geddes: Four Projects from the Collection of the Harry Ransom Center (University of Texas at Austin thesis, 2007).