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[2], 363 pp.; errata leaf. Illustrated with 10 color lithographed plates; 4 folding maps. (8vo) 22.x14. cm (8¾x5½"), period half morocco & cloth, spine lettered in gilt, marbled endpapers & edges. First Edition.

Detailed report with a spectacular series of lithographed plates, and four important maps. Wagner-Camp describes the work, "Captain Mullan's report with an itinerary comprises pages 1-84 and is followed by the engineers' reports and other meteorological and astronomical data. It covers the period from March 1858 to September 1862." Wheat goes into much detail in the maps and the roadbuilding expedition, noting this work as a "comprehensive, highly interesting 363-page report, accompanied by four elaborate maps, all of which require to be described... The Mullan Trail was unquestionably the most famous road ever constructed in the high Northwest..."

The maps are:

• Map of the Mountain Section of the Ft. Walla Walla & Ft. Benton Military Wagon Road from Coeur d'Alene Lake to the Dearborn River Washington Territory... (52x126 cm).
• ...Map of the Military Reconnaissance from Fort Taylor to the Coeur d'Alene Mission, Washington Territory... (53.5x50 cm).
• ...Map of Military Reconnaissance from Fort Dalles, Oregon, via Fort Wallah-Wallah to Fort Taylor, Washington Territory... (52x88 cm)
• ...Map of Military Road from Fort Walla Walla on the Columbia to Fort Benton on the Missouri... (43x84.5 cm)

Graff 2932; Howes M884; Sabin 51275; Tweney 56; Wagner-Camp 393; Wheat Transmississippi Vol. 5, pp.85-95, maps 1077, 1078, 1079, 1080.