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Geological Survey
Geologic Setting of the John Day Country, Grant County, Oregon
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Geologic Setting of the John Day Country, Grant County, Oregon
By Thomas P. Thayer
![cover of document](images/cover.jpg)
1990 edition cover
1972 Reprinted 1990
Pacific Northwest National Parks and Forests Association
TABLE OF CONTENTS
inf/john_day/index.htm
Last Updated: 28-Mar-2006
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