(1909). Pennsylvania Railroad: An exhibit of photographs and models of physical improvements and equipment at the "1915" Boston Exposition : November 1 to 27, 1909. Philadelphia, Pa.: Pennsylvania Railroad Co..

Pennsylvania Railroad: An Exhibit of Photographs and Models of Physical Improvements and Equipment At the "1915" Boston Exposition : November 1 to 27, 1909. Philadelphia, Pa.: Pennsylvania Railroad Co., 1909.

Pennsylvania Railroad: An Exhibit of Photographs and Models of Physical Improvements and Equipment At the "1915" Boston Exposition : November 1 to 27, 1909. Philadelphia, Pa.: Pennsylvania Railroad Co., 1909.