1. The Tidal Wave of Metropolitan Expansion
2. 4R. R. Boyce "The Edge of the Metropolis: A Wave Theory Analog Approach,"Proceedings, Canadian Association of Geographers, B. C. Division, 1966 , forthcoming.
3. 5L. Brown "A Bibliography of Spatial Diffusion,"Discussion PaperNo. 5, Northwestern University, 1965 .