SPEECHES - Ground-water hydrology--the state of the art and science, by Joseph T. Callahan



                          UNITED STATES
                    DEPARTMENT OF THE INTERIOR
                         GEOLOGICAL SURVEY
                     Water Resources Division
                        Washington 25, D.C.

In reply refer to:                               November 22, 1965
                                                 Code:  4050 0001

GROUND WATER BRANCH MEMORANDUM NO. 66.4

To:       District Chiefs and Staff Officials

From:     Acting Chief, Ground Water Branch

Subject:  SPEECHES - Ground-water hydrology--the state of the art
                     and science, by Joseph T. Callahan

Transmitted herewith is a copy of Mr. Callahan's speech presented
at the Water Resources Division Conference in Dayton, Ohio,
November 3, 1965, as requested by various field personnel.



                                  (s) Gerald Meyer

Attachment

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