; GRAPH EXPLORATIONS & SURVEYS 
WEST OF THE ONE HUNDREDTH MERID1A 
SEASONS of 1809,1871,1872,1873 <$■ 1S74. 
Index Area# to Atlas Maps. 
PrinutiyAstj-ononaial .Stations' completed. 
Points proposed tor primary Astronomical Stations-. 
BY ORDER OF THE HONORABLE WM . W. BELKNAP, S E ORE T ARY OF WAR. 
EXPLANATIONS. 
Areas' Surveyed by parties under Lieut. Wheeler- Expeditions of 1869, 1871. ' ' j 
, , „ 1872, 1873. f- 
.Irens end raced by the Surrey of the J07 Parallel, i Clarence King 1874. 
< in rJwrgc. 1 
1?. lieut. Geo.M "Wheeler, Corps of Engineers,in charge. 
Lines o f ^Expeditions, prosecuting Explorations and Surveys, conducted by 
'Officers of the Line," “Corps of Topographical Engineers,"and"CorptS'ofJEngmeers? US. Army 
Proposed 7’elegraph Zincs - 
MyJiUny Posts ^ 
Existing 1 Telegraph Lines . 
\ I'M 
UNDER THE DIRECTION OF BRIG,GEN. a A.HUMPHREYS, CHIEF, OF ENGINEERS UNARM 
