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In'terstate High'way Sys"tem

a network of U.S. highways connecting the 48 contiguous states and most of the cities with populations above 50,000, begun in the 1950s and estimated to carry about a fifth of the nation's traffic.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

Interstate Commerce Commissioninterstellar


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