Close to one-half of the sections in the Doctrine and Covenants were given in Ohio. Many of these contained fundamental doctrines and principles which were of major importance in the development of The Church of Jesus Christ of Latter-day Saints in its formative years. This article presents a table containing chronological information and detailed data on the Ohio revelations, as well as sections on the identification of the manuscript, the problem of errors in recording, and the historical setting.