The Toledo and Ohio Central Railroad (T&OC) was a railroad with two primary branches, an Eastern and a Western, which ran from Toledo to Thurston Ohio. The Western Branch ran through Columbus. In Thurston the branches combined and continued Southeasterly through Ohio to Coal Mines beyond Charleston, W. Va. There were also various other branch lines. Rail service continues today on almost all of the Western Branch and the main line through Charleston, W. Va. Survey crews recorded field measurements in field books and brought them into the office for creation of maps and for other uses. The field books in this collection, generously shared by a private collector and on loan to the State Library of Ohio for digitization, contain field notes from the late 19th and early 20th centuries.