. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Figs. 72-75. Pennsylvania Railroad Standard Rails, 1875, 1880, 1887, 1890. (From ilrnwings inthe U. S. National Museum.). Figs. 70 79. Standard Chicago, Burlington and Quincy Railroad Company's Standard Rails 18C-, 1880, L885, L890. Prom chart I CI U. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. Figs. 72-75. Pennsylvania Railroad Standard Rails, 1875, 1880, 1887, 1890. (From ilrnwings inthe U. S. National Museum.). Figs. 70 79. Standard Chicago, Burlington and Quincy Railroad Company's Standard Rails 18C-, 1880, L885, L890. Prom chart I CI U. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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