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Hours of greatest and least activity
Illustration shows different times of the day and the varying degrees of telephone activity at that point of the day.
22 x 40.5 cm
black and white
- still image
- These materials are either in the public domain, according to U.S. copyright law, or permission has been obtained from rights owners. The digital version and supplementary materials are available for all educational uses worldwide.
- The Janet A. Ginsburg Chicago Tribune Image Collection
- Chicago Sunday Tribune (April 4, 1897), Part 5, p. 1