[Hallen, Ernest “Red”] (1875-1947). Interesting Collection of Twenty-Nine Loose Original Gelatin Silver Photos of Construction and Maintenance of Panama Canal by the U.S. Administration in ca. 1906-1916, Taken by the Official Photographer of the Isthmian Canal Commission, Ernest Hallen, Including Early Images of Camacho Reservoir and U.S. Surveyors at the Culebra Cut in 1906, Panamanian Prisoners Constructing a Road in the Canal Zone in 1910, Sunken U.S. Steamer “Newport” in the Port of Balboa in 1912, One of the Earliest Test Voyages in the Canal by Steamer “Advance” (August 9, 1914), Several Scenes of Excavations of Landslides in the Culebra/Gaillard Cut in 1915-1916, After the Official Opening of the Canal, and Several Views of Panama City, the Port of Cristobal, &c. Ca. 1900s-1910s.