Alluvial Fan Flooding (1996)
   This book is edited by the Commission on Geosciences, Environment and Resources (CGER) and published by the National Academies Press. It deals with alluvial fans that are known as gently sloping, fan-shaped landforms created over time by deposition of ero
   http://www.nap.edu/books/0309055423/html/index.html

Bedform Sedimentology Studies
   Information about ripples, dunes, and sedimentary structures including, explanatory text, computer-generated images and movies, photographs, and bedform-simulation software provided by the USGS.
   http://walrus.wr.usgs.gov/seds/

International Stratigraphic Guide
   The second edition of the International Stratigraphic Guide, edited by Amos Salvador, was prepared by the International Subcommission on Stratigraphic Classification of the International Commission on Stratigraphy and co-published in 1994 by the Internati
   http://www.stratigraphy.org/guide.htm

Low–temperature formation of Dolomite and Magnesite
   Latest version (2005) of the open-access e-book authored by J.C. Deelman on dolomitization and related phenomena. A total of 505 text pages, including a number of graphs, drawings and photographs.
   http://www.jcdeelman.demon.nl/dolomite/bookprospectus.html

North American stratigraphic code (2005)
   A reference book published under the aegis of the North American Commission on Stratigraphic Nomenclature.
   http://ngmdb.usgs.gov/Info/NACSN/Code2/code2.html

Petrology of sedimentary rocks
   Although long out of print, the seminal book (a total of 182 pages in a single pdf file) by R.L. Folk (1974) remains an excellent resource if you are interested in sedimentary rocks.
   http://www.lib.utexas.edu/geo/folkready/

Principles of Geology, by Charles Lyell 1830
   Electronic facsimile of one of the founding book of the geological sciences, made available by Electronic Scholarly Publishing
   http://www.esp.org/books/lyell/principles/facsimile/

Reports of the Illinois Geological Survey authored by A.H. Worthen
   This set of 8 volumes published between 1866 and 1890 is a rich resource of information about Illinois geology, landscape and mineral resources.
   http://worthen.lib.uchicago.edu/

Schlumberger Oilfield Glossary
   With more than 4600 entries it constitutes an instant technical reference for both the generalist and the expert oil geologist
   http://www.glossary.oilfield.slb.com/