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| | Highway Route Markers: Acknowledgments |
 | | Kansas U.S. 56, Eisenhower Interstate System, Oregon Trail, Native American route |
 | | Australia; New Zealand; Japan; California U.S. 97, and U.S. 99; standard county pentagon; Oregon U.S. 30; Washington |
 | | District of Columbia, Canadian signs, Capital Beltway, U.S. 101, Great River Road, signs from Connecticut, Delaware, Florida, Illinois, Kentucky, Maine, Missouri, New Jersey, New York, Pennsylvania, Texas, Vermont, Virginia, Wisconsin. |
| www.ugcs.caltech.edu /~jlin/signs/acks.html (225 words) |
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