U. S. GEOLOGICAL SURVEY BULLETIN 707 PLATE XLI 
A. GOLD DREDGING. 
ess i like those used in deepening harbors and in excavating the Panama Canal are 
t to work in the heart of the Rocky Mountains, degiee up and washing gravel for the pa i 
it cc nite 1ins. This view shows the great heap of wz ashed gravel that is left in the wake of the 
dredge. P hotogr: uph by F. L. Ransome. 
B. RAINBOW HIGHWAY. 
a now traverse the grand canyon of the Arkansas as readily as railroad trains, owing 
to the recent completion of the Rainbow bichon oo Parkd: le 4 to Leadville. In many 
places the cost of cons ares tion was as Ba eat as tha the railroad on the opposite ban k. 
Phctosceih by the U.S. Forest Servie 
