Benchmark Papers in Geology--Volume 72, Physical Hydrogeology, Edited by R. Allan Freeze and William Back; Volume 73, Chemical Hydrogeology,



             UNITED STATES DEPARTMENT OF THE INTERIOR
                        GEOLOGICAL SURVEY
                        RESTON, VA. 22092

In Reply Refer To:                            May 24, 1984
WGS-Mail Stop 411


GROUND WATER BRANCH TECHNICAL MEMORANDUM NO. 84.02

Subject:  PUBLICATIONS--Benchmark Papers in Geology--Volume 72,
                        Physical Hydrogeology, Edited by R. Allan
                        Freeze and William Back; Volume 73,
                        Chemical Hydrogeology, Edited by William
                        Back and R. Allan Freeze

Each of the volumes of the Benchmark Papers in Geology series is a
collection of key papers in a major field of geology.  The subject
volumes are devoted to the field of hydrogeology.  They contain
papers that are judged to have had a revolutionary impact on the
science of hydrogeology in that they present ideas "outside the
mainstream of evolutionary development and deflect the mainstream
into new and rewarding channels of investigation."  Selected
papers also are included that are "from the evolutionary periods
of development that have had recognized and lasting impact."  In
addition, preceding each section of the volumes the editors note
other significant papers and review articles that could not be
included in these volumes.  The overall presentation guides the
reader through the historical development of the field of
hydrology.

One copy of each volume is being sent to each District Office to
be included in the District library.  Please make known the
availability of these volumes to all ground-water hydrologists.
Please circulate a copy of the table of contents of these volumes
among District personnel.



                              (s) Ren Jen Sun
                              Acting Chief, Ground Water Branch

Distribution:  A, B, S, FO, PO