P C Jeffries. Pencil Points 20 June 1939, 404 Norman Bel Geddes. Pencil Points 18 January 1937, 13 Charles Z Klauder. Pencil Points 20 January 1939, 31 Herman Knebel. Pencil Points 20 June 1939, 409 Briggs. Pencil Points 12 January 1931, 54 Lewis Hobart. Pencil Points 18 June 1937, 389 Le Corbusier. Envisioning Architecture (MoMA, New York, 2002) 1938, 86 Francis E Lloyd. Architect and Engineer 138 39 July 1939, 48 Barry Byrce. Architectural Record 68 30 August 1930, 192 Johnson Kaufmann Coate. Pencil Points 20 July 1939, 430