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Immigrants building the transcontinental railroadAsian and European immigrants working on the last mile of the transcontinental railroad, 1869. Hand-colored woodcut of a 19th-century illustration
Excavating the Panama CanalWorkers using explosives to excavate the Panama Canal, 1900s. Printed color halftone reproduction of an early 20th-century illustration
BUSN2A-00078Coal miners tamping an explosive charge in a tunnel, 1860s. Hand-colored woodcut of a 19th-century illustration
