Modeled by Ernest Burgess in the 1920's
Modeled by Homer Hoyt in the 1930's
Modeled by Chauncy Harris and Edward Ullman in the 1940's
Modeled by T. G. McGee in 1967
Modeled by Ernst Griffin and Larry Ford in 1996
Modeled by E. H. Fouberg, A. B. Murphy, and H. J. de Blij
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