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File:United States Effective Ground Conductivity Map.png

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English: United States Effective Ground Conductivity Map
Author United States Federal Government, FCC


Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Effective ground conductivity corresponds to broadcast-band signal propagation in the continental United States

Items portrayed in this file


February 1950

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current19:29, 8 February 2013Thumbnail for version as of 19:29, 8 February 20131,544 × 974 (499 KB)Runxctry{{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|United States Effective Ground Conductivity Map}} |Source = |Date = 02/1950 |Author = United States Federal Go...
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