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This study was supported by National Science Foundation grant GS-1082. The data were assembled by G. Aspbury; M. Landman and F. Rens performed the programming and required computations in conjunction with the University of Michigan Computing Center.
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Tobler, W.R. The spectrum of U.S. 40. Papers of the Regional Science Association 23, 45–52 (1969). https://doi.org/10.1007/BF01941871
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DOI: https://doi.org/10.1007/BF01941871