Brinton, Willard Cope, 1880- · New York, The Engineering magazine company · leaf 255
238 GRAPHIC METHODS The 228 Principal Trading Centers … Fig. 192. The 228 Principal Trading Centers in the United States This illustration was taken from an advertisement proclaiming that a certain magazines circulation was mainly in the 228 chief trading centers of the country, and that, accordingly, the magazine must be effective as an advertising…
Graphic methods · Statistics
Internet Archive · Cornell University Library · Public domain (published before 1931). Free to use for anything.
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