EXPLORATIONS FROM A. D. 1800 TO A. Dp. 1832. 23 
RECTOR'S AND ROBERDEAU'S COMPILED MAP, 1818. 
This map is titled, ‘‘ Sketch of the western part of the continent of North America, between lati- 
tudes 35° and 52° N.,’’ from the 87th meridian to the Pacific ocean, on a scale of about 47 
miles to an inch. ‘‘ This map, of an extent of country including more than 20° of latitude and 50° 
of longitude, was originally drawn under the inspection of William Rector, esquire, surveyor of the 
United States for the Territories of Missouri and Illinois, and was by him presented to the General 
Land Office, January 21, 1818. It is probably the most correct map of the country now extant. 
Signed Josiah — General Land Office, January 21, 1818; Roberdeau,. U. S. T. Engineers, 
del. 
From the year 1807 to 1819, our country was much of the time involved in foreign difficulties, 
and little was done, so far as I have been able to learn, in exploring our western possessions. 
This map of Rector and Roberdeau has, I believe, never been published ; and, as it shows the 
extent of the existing information at that time, which was prior to the expeditions of Major 
Long, I have thought it desirable to present a reduced copy, (Plate II.) On it, as on Pike's 
map, the Red river of Louisiana is represented as heading where the sources of the Canadian 
are now known to be. The Rio Grande is represented as rising to the north of the sources of 
the Arkansas, near those of the Bighorn river, or near the true position of the و‎ of Green 
river. The sources of Lewis’ Fork of the Columbia are correctly rep ted ly to those 
of the Yellowstone. The Rio de San Rafael is indicated as the most northern branch of the 
Colorado of the West, as itis on Humboldt’s map of New Spain. The Wallameth is represented 
as heading near the Rio San Rafael, as it is on Lewis and Clarke’s map. Only one large river is 
represented as flowing into the bay of San Francisco, heading to the southeast of it. Neither 
the Great Salt lake, nor Lake Salado, nor. Lake Timpanogos, nor any other in this region, is 
represented. On it there is no indication of those hypothetical streams, the Rio San Buena- 
ventura, the Rio Timpanogos, or the Rio los Mongos, flowing from a large lake into the Pacific; 
rivers which had gained a place, and continued long after to be represented on English maps. 
The representations of mountains west of the Rocky mountain range is quite ^ but it 
Pn À— 
abd MAJOR S. H. LONG'S FIRST EXPEDITION, 1819 AND 1820. MET 
VOR bd dbi ره تور )روگ‎ geimer1810 
and 1820, by order of the Hon. J. C. Calhoun, Secretary of War, under the command of Major 
Stephen H. Long, from the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring 
party: compiled by Edwin James, botanist and geologist for the expedition. In two volumes, with 
an atlas. Philadelphia: H. C. Carey and I. Lea, Chestnut street.—1823.’’ This book also 
contains Major Long’s official report. Accompanying the publication is a map, in two sheets, 
on a scale of 75 miles to an inch, embracing the country from the meridian of Washington to 
the Rocky mountains, between the 33d and 47th parallels. The original map in the Topo- 
graphical Bureau is in one sheet, on a scale of 36 miles to an inch. The same work was 
republished ‘‘in three volumes in London: printed for Longman, Hurst, Rees, Orme oe 
Paternoster Row.—1823.”’ 
This expedition started from Pittsburg, Pennsylvania, early in April, 1819, on hina the 
small steamboat Western Engineer, under command of Major Long. He was assisted by 
Major Biddle, Lieutenant J. D. Graham, U. S. A., Cadet W. H. Swift, Dr. Baldwin, Dr. 
