- Schlumberger Oilfield Glossary
- www.glossary.oilfield.slb.com
- Defines many terms related to oil and gas exploration and production. Includes illustrations.
4.2
(si*)
>20
<5
7
- Reports of the Illinois Geological Survey authored by A.H. Worthen
- worthen.lib.uchicago.edu
- This set of 8 volumes published between 1866 and 1890 is a rich resource of information about Illinois geology, landscape and mineral resources.
3.9
(si*)
<5
-
5
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