#3125 – Argo Mill and Mine, longest mining tunnel
in the world, runs 5 miles through the mountains
from Idaho Springs to Central City, Colorado. It
was started in 1893 and completed in 1910. Not
active since 1943.
Pub. by Sanborn Souvenir Co. Inc., Denver, Colorado
DEXTER PRESS, INC.
WEST NYACK, NEW YORK
10 x 95323-B
dp
June 29,80
