Moses Greeley Parker suggested the format of the telephone directory be changed so that subscribers appeared in alphabetical order and each telephone be identified with a number. The directory was not alphabetized and no numbers were associated with the people included in it. The first telephone directory, consisting of a single piece of cardboard, was issued on 21 February 1878 it listed 50 individuals, businesses, and other offices in New Haven, Connecticut that had telephones. Books listing the inhabitants of an entire city were widely published starting in the 18th century, before the invention of the telephone. Telephone directories are a type of city directory. The first telephone directory, printed in New Haven, Connecticut, United States, in November 1878 Printed directories were usually supplied free of charge. In many countries directories are both published in book form and also available over the Internet. In the latter case, the directory can be on physical media such as CD-ROM, or using an online service through proprietary terminals or over the Internet. Telephone directories can be published in hard copy or in electronic form. Other colors may have other meanings for example, information on government agencies is often printed on blue pages or green pages. (These listings are often published separately, in a city directory, or under another name, for a price, and made available to commercial and government agencies.)
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