Revision History for OFR 2016-1100 

Preliminary Results from Exploratory Sampling of Wells for the California Oil, Gas, and Groundwater Program, 2014–15
By Peter B. McMahon, Justin T. Kulongoski, Michael T. Wright, Michael T. Land, Matthew K. Landon, Isabelle M. Cozzarelli, Avner Vengosh, and George R. Aiken

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Posted online August 3, 2016
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Revised and reposted January 31, 2017
References added for Davis and others, and Dillon and others.
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