Urbana, Ill. : State of Illinoid, Dept. of Registration and Education, State Geological Survey Division, 1927
Physical Details
1 map : color ; 124 x 72 cm + booklet (74 pages ; 23 cm)
OCLC
ocm05901782
Cartographic Data
Scale 1:500,000. Approx. 8 miles to 1 inch
(W 91°30ʹ--W 87°30ʹ/N 42°30ʹ--N 37°00ʹ).
Accompanying booklet entitled: Directory of Illinois mineral operators : to accompany Mineral industries map, January 1, 1927 / compiled by H.P. Christensen and E. Erb.