References: Empiric Regularities in the Frequency-Distribution of Chemical Manufacturers and Chemical Distributors by Product-Diversity in the U. S. A., 1949

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References

Buyers Guide Section . 1949 . Chem. Indust , 65 : 49 – 545 . (No. 5, November)
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Zipf , G. K. 1949 . Human Behavior and the Principle of Least Effort , Cambridge : Addison-Wesley Press .
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Empiric Regularities in the Frequency-Distribution of Chemical Manufacturers and Chemical Distributors by Product-Diversity in the U. S. A., 1949

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