Wrightscapes: Frank Lloyd Wright's Landscape Designs - Block Plan for Charles E. Roberts, project - FLLW Archive Drawing Number 0309.001: Drawing (p. 55, fig. 3-8)

Drawing Citation

Drawing 001 - Prelinimary study for the swastika rotated scheme
Block Plan for Charles E. Roberts, project (is cited in)
Wrightscapes: Frank Lloyd Wright's Landscape Designs (published in)