A Source book for Photographers and Explorers. Descriptions to all of Ohio's 146 Remaining Historic Covered Bridges, as well as over a hundred photographs of them. GPS Positions and written directions. Photo tips for each bridge. A short history of Covered Bridges in North America and a review of the various Truss Types and information on the important bridge builders of Indiana. Step by Step Instructions for your own Self Guided Tours of Ashtabula County Fairfield County Preble County Washington County