Text vol. has half-title: United States Exploring Expedition.

Added half-title: Hydrography, with vol. I and II Charts.

"By authority of Congress"--Half-title p., text; t.p., atlases.

Vol. 1 of atlas was first published in 1850; 30 of the 100 copies printed were destroyed by fire and replaced by an edition with imprint date 1858. Vol. 2 of atlas was published in 1858, text in 1861.

Atlases have title: Atlas of charts. Vol. I-[II]. From the surveys of the Expedition.

Atlases lack series vol. designation; publisher's statement varies slightly.

On cover of atlases: Hydrography. Ex. Ex. Volume 1-[2]

Atlas, v. 1: [55] leaves of plates (9 folded); atlas, v. 2: 56-106 leaves of plates (13 folded)

Edition of 100 copies.

The charts were also sold separately.

Includes index.

Haskell, 80, 83-85.

WSU MASC has bookplate on front pastedown: "Presented by the Congress of the United States to the Territory of Idaho".

WSU MASC copy donated by C. M. Brewster.

WSU MASC copy blind stamped on front free endpaper: "F. B. Laney" and ink stamped on back pastedown: "Francis T. Laney, Moscow, Idaho".

WSU MASC copy lacks half-title page and has only 4 maps.

WSU MASC copy is: 002-115009797.