- 1 D. Dale Condit
Structure of the Berea oil sand in the Summerfield Quadrangle, Guernsey, Noble, and Monroe Counties, Ohio
Washington, D.C.: Gov. Print. Off. 1916; Seite 218 - 231; Kt., graph. Darst. - 2 D. Dale Condit
Structure of the Berea oil sand in the Woodsfield Quadrangle, Belmont, Monroe, Noble, and Guernsey Counties, Ohio
Washington, D.C.: Gov. Print. Off. 1916; S. 234 - 249; Kt., graph. Darst.