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Because of recent changes in tarifs, many of the costs given in the much needed and informative subject correspondence by G.A. Barnard named above (ibid., vol. COM-12, pp. 228-230, December 1964) are not those now in effect. Moreover, some of the costs given there were computed incorrectly or from inapplicable tariffs. Rates currently charged are given here in Table I. Costs of both a 250-mile and a 1000-mile channel derived from these rates are given here in Table II as a function of a bandwidth. These tables inch1de "local channel" and "channel terminal" costs but not other charges which are often part of the~cost~of communication services, for example, construction and installation charges, special signaling or control circuits, special input-output equipment, or extensions. Rates shown here are on a monthly basis. Rates for "occasional" or "one-time" use are higher. Where rates are shown on an hourly basis, nonconsecutive hours are charged at higher rates.