World Guide to Covered Bridges

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The World Guide to Covered Bridges (WGCB) is a covered bridge numbering system. The system was invented by John Diehl, the chairman of the Ohio Covered Bridge Committee. The committee first used the numbering system in 1953 to publish a list of covered bridges in Ohio.[1]


  1. ^ Dr. James E. Reinoehl (1998-05-19). "The Covered Bridge Numbering System". Ohio Covered Bridge Homepage. Archived from the original on 2005-04-07. Retrieved 2009-09-15.