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II.-ANNUAL REPORTS OF PROGRESS.

I. —EXPLORATIONS OF 1867.

[First Annual Report of the United States Geological Survey of the Territories,embracing Nebraska. By F. V. Hayden, U. S. Geologist . Conducted under theauthority of the Commissioner of the General Land-Office, 1867. ] A Report of theCommissioner of General Land-Office, for the year 1867. Washington , 1867.pp. 128-181, where it appeal's in the form of a letter dated “Nebraska City ,July I, 1867,” without any other heading.

II. —EXPLORATIONS OF 1868.

[Second Annual Report of the United States Geological Survey of the Territories,'embracing Wyoming. By F. V. Hayden, U. S. Geologist . Conducted underthe authority of the Commissioner of the General Land-Office, 1868. ]<[ Report of'the Commissioner of General Land-Office, for the year 1868. Washington .1868. pp. 220-255, where it appears in the form of letters dated “ Fort Steele,Union Pacific Railroad , Septembers, 1868,” and “Fort Sanders, WashingtonTerritory, September 25, 1868,” under the heading “Report of F. V. Hayden on the Geography of the Missouri Valley.”

III. —EXPLORATIONS OF 1869.

Preliminary Field Report | of the | United States Geological Survey | of | Colo-rado and New Mexico, | conducted | under the authority of Hon. J. D. Cox,Secretary of the Interior. | By F. V. Hayden, | United States Geologist. | — |Washington: | Government Printing Office . | 1869. [8vo, IJ 5 PP-]

- CONTENTS.

Report of F. V. Hayden.—Geological report, pp. 7-99.

Report of Persifor Frazer, jr,—Mines and minerals of Colorado , pp. 101-130.

Report of Cyrus Thomas.—Agriculture of Colorado , pp. 131-155.

IV. —EXPLORATIONS OF 1870.

Preliminary Report | of the | United States Geological Survey | of | Wyoming ,and | Portions of Contiguous Territories, | (being a second annual report of prog-ress,) | conducted | under the authority of the Secretary of the Interior, | by |F. V. Hayden, | United States Geologist. [ — | Washington: | GovernmentPrinting Office . | 1872. [8vo, 511 pp.]

CONTENTS.

Part I. Report of F.V. Hayden.—Geological survey of the Territories, pp.9-81.

Part II. [Report of F. V. Hayden .]—Geology of the Missouri Valley, pp.

83-188.

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