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Length of the coast lines of the States and the principal outlying
possessions

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Geographic centers of the continental United States and of the several
States.

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Extreme and mean altitudes of the States and principal possessions--
The United States and its possessions..

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257

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4. Map of the United States showing routes of the principal ex-
plorers from 1501 to 1844..

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5. The Mitchell map of the British and French dominions in North
America, 1755....

6. Part of the Disturnell map of Mexico, 1847...

In pocket.
In pocket.

7. Highest and lowest points in the United States: A, Mount
Whitney; B, Death Valley.--

40

8. Northernmost and southernmost points in United States terri-
tory: A, Point Barrow, Alaska; B, Rose Island, Pacific
Ocean..

9. Typical boundary marks, old and new...

40

120

10. A, Section of a tree that had been used as a boundary mark;

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FIGURE 1. Map of Maine showing claims of the United States and Great
Britain....

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2. Map of the United States showing accessions of territory from
1803 to 1853_.

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3. Map of the United States showing accessions of territory since
1853_.

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4. Map showing the relative size of Alaska and the United States__
5. Map of the Canal Zone..

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6. Relative size of possessions of the United States..

7. Map of the Gore, at the northeast corner of Vermont

8. Historical diagram of New York...

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84

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19. Historical diagram of North Dakota and South Dakota.

209

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23. Marks on the tablet at the southeast corner of New Mexico.__

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FOREWORD

The first United States Geological Survey record setting forth the history of the boundaries of the United States and the several States and Territories was prepared by Henry Gannett, assisted by Franklin G. Butterfield, and was published as Bulletin 13 of the Geological Survey in 1885. The second edition, revised and enlarged by Henry Gannett, was published as Bulletin 171 in 1900. The third edition, also revised by Henry Gannett, was published as Bulletin 226 in 1904. A reprint of this edition with minor corrections was issued in 1906. A revision and enlargement of Bulletin 226 which included additional matter incidentally connected with boundaries was prepared by Edward M. Douglas and issued in 1923 as Bulletin 689. The present bulletin is a revision and enlargement of the 1923 edition. It is the desire of the Geological Survey to make this publication a complete record, and therefore suggestions for the addition of any germane material will be welcomed.

VII

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