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24 J. Elfreth Watkins. Contributions of the Department of Transportation and Engineering to the Ohio Valley Centennial Exhibition. Proceedings U. S. National Museum. Vol. XI Appendix. No. 45. A catalogue of [[blank]] objects exhibited by the Section at the [[underline]]Cincinnati Exposition[[/underline]]. J. Elfreth Watkins. The Evolution of the Railway Passenger Car. Supplement to Harper's Weekly, Aug. 25, 1888. Describing the construction of various types of passenger railway cars with 26 illustrations showing the successive steps, that have lead up to the most improved [[underline]]modern parlor and [[/underline]] sleeping cars.