Panama Canal under construction, circa 1912

stereograph

Stereograph of Panama Canal under construction; published by the Keystone View Company; caption below photograph reads "21716- East Center and West Walls of Upper Lock Under/ Construction, Conveying Concrete by Chutes;/ Miraflores Locks, Panama Canal."; detailed information on the building of the canal is printed on the back of the card; copy of this information is in folder 99.84; Copyright 1912 printed on back.