38 EXPLORATIONS FROM A. D. 1832 To a. D. 1844. 
TOPOGRAPHICAL BUREAU MAP OF OREGON, 1838. 
The title of this is **.4 map of the United States territory of Oregon west of the Rocky mountains, 
exhibiting the various trading depots or forts occupied by the British Hudson Bay Company con- 
nected with the western and northwestern fur trade, compiled in the Bureau of Topographical Engi- 
neers, from the latest authorities, under the direction of Colonel J. J. Abert, by oe Hood, 
1838. M. H. Stansbury, del." 
This map accompanies the report of Mr. "iii from ‘‘the select committee to thine was 
referred a bill to authorize the President of the United States to occupy the Oregon Territory, 
submitted to the Senate," which report forms Senate document 470, 2d session 25th Congress. 
The map is published on a scale of twenty-five miles to an inch, and embraces the Mu" 
of North America from the 38th to the 55th parallel west of the 102d meridian. à 
All of this map, between the 40th and 50th parallels, with some trifling changes, was pub- 
lished in Wyndham Robertson's work, entitled ‘‘Oregon, our Right and Title," &c., published 
in Washington, 1846. 
It appears as if the map of Captain Bonneville was used in making this compilation, but that 
full eredence was not given to his representations, for the Rio Buenaventura as well as Mary's 
river finds a placeon it. In order to accommodate both, Mary's (Humboldt) river was placed 
too far north, and the lakes into which it sinks were omitted. A doubtful character was given 
to the representation of the Rio Buenaventura, and it was indicated as joining with the Sacra- 
mento river by a stream called ‘ Debeption. river." 
MEMOIR AND MAP BY CAPTAIN HOOD, 1839. 
Captain Washington Hood, Topographical Engineers, while stationed on the Missouri frontier, 
compiled, in 1839, a map, on a scale of forty-two miles to an inch, of the country adjacent to 
the headwaters of the Missouri, the Yellowstone, the Salmon, the Lewis, and the Colorado, 
with various observations on the subject of the practicable passes or routes through the Rocky 
mountains to the Pacific, ‘‘ from information obtained in frequent conversations with two highly 
intelligent trappers, William A. Walker, of Virginia, and Mr. Coates, of Missouri, who belonged 
originally to Captain Bonneville’s party, but subsequently continued to roam the mountains as 
free trappers during six consecutive years; as also that derived from others, who were connected 
with surveys and expeditions as far to the westward as Santa Fé and Taos.’ 
‘This map is correct in its main features, but neither it nor the notes were ever published. 
The Black Hills and Big Horn mountains are represented with a general northwest trend... He 
recommended wood, sh Oregon from. the sources of the Big Shyenne through the Black Hills; 
thence westward, p rth of the Big Horn mount and striking the Yellowstone near the 
mouth of Twenty fivo liec k-th 1 +} Y tai tn tha +h ifr ot thin Missouri ; . 
J IC 3 
thence up the Jm» Fork e its porthens- Rey a over to the source of the Bitter. 
Root river. Betweenthe Black Hills and the Yellowstone this route has not yet been explored. 
From the Bitter Root river to the Pacific it has been fully explored by Governor Stevens. 
Captain Hood erroneously puts down the Bitter Root in source of the Salmon river. 
SURVEY OF THE BOUNDARY BETWEEN LOUISIANA. AND TEXAS IN 1840. 
— of the com 
TET 
oii eden inal asc acia idc d S ME 
nission will be found in Senate document No. 199, 2d session 27th 
Congress, and is accompanied by two maps: one, on a scale of one and a half mile to an inch, — 
sob ag dM X D UM Li Moe 
