Wrightscapes: Frank Lloyd Wright's Landscape Designs - Block Plan for Charles E. Roberts, project - FLLW Archive Drawing Number 0309.006: Site Plan (p. 57, fig. 3-9a)

Drawing Citation

Drawing 006 - Site plan on regular lots with alternate rotation.
Block Plan for Charles E. Roberts, project (is cited in)
Wrightscapes: Frank Lloyd Wright's Landscape Designs (published in)