Geological Survey of Ohio, Fourth Series, Bulletin 9: Coal, Geology by J. A. Bownocker, Chemistry by N. W. Lord and E. E. Somermeier, published by Authority of the Legislature of Ohio, Under the Supervision of the State Geologist, at Columbus, Ohio, May 1, 1908 — 342 pages — illustrated — 2 maps: 17 1/4" x 26 1/4"

Contents:

• Letter of Transmittal
• Announcement by the State Geologist : Bulletin 9
  
• Part One:
• Coals of the Monongahela Formation or Upper Productive Coal Measures
• Part Two:
• Chemical Analyses and Calorific Tests of the Clarion, Lower Kittanning, Middle Kittanning and Upper Freeport Coals
• 2 Maps in attached envelope on final end-paper