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F.L. Knight & Sons
4
T.H. Ball
3
C. Wm. Roehrig
1
Crown Point Register
1
Dept. of Agriculture, Soil Conservation Service (Washington.)
1
Geological Survey, Dept. of Natural Resources
1
Indiana University, Indiana Geological Survey
1
Lake County Engineer
1
State Highway Commission of Indiana
1
The Bureau
1
W.D. Jones?
1