Pror. EpwaArpD ORTON, JR., State Geologist: 
My Dear Sir: — I transmit herewith a report on The Occurrence and’ 
Exploitation of Petroleum and Natural Gas in Ohio, the field work for 
which was done during the summers of 1900, 1901 and 1902. During the 
last summer Mr. M. W. Mumma assisted, his time having been given to 
the Trenton limestone fields. I place on record at this place my appre- 
ciation of his energy and efficiency. Many citizens of the state have ren- 
dered assistance, and an effort has been made to give them due credit at 
the proper place in this volume. The Ohio Oil Company generously sup- 
plied field maps of the Trenton limestone areas, and the Carter Oil Com- 
pany, through H. M. Stanberry, rendered like service in the southeastern: 
part of the state. Hon. Harry E. Smith of Marietta, who is well informed. 
concerning the oil and gas territory of his part of the state, has been ex- 
tremely obliging and encouraging. ; 
In conclusion I desire to extend to you my sincere thanks for your 
hearty co-operation. 
7 Respectfully submitted, 
May 1, 1903. J. A. BowNocKeER. 
