Wilkens, Cleo Goff. Index to 1840 Federal population census of Ohio. [electronic resource] / Alphabetized by F. Howard Wilkens.. — [Fort Wayne, Ind.], 1969-. — v. 28 cm.
v. 1. A - D counties. - v. 2. E - K counties. - v. 3. L - P counties. - v. 4. R - W counties.