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  1. Map showing proposed lines of aqueducts from the Delaware and Lehigh Rivers and Perkiomen Creek also available waterways of the Neshaminy, Tohickon, Mill and Perkiomen Creeks and of certain tributaries of the Delaware and Lehigh Rivers north of the Blue Mountains.  1885.  Philadelphia Water Department, Surveys for a future water supply.  Plate II.
  2. [Delaware River, Lower Delaware Sub-Basin, Philadelphia County, Philadelphia City Municipal Water Works.] [report from Assistant Engineer, ca. 1915?] [content:  Queen Lane Supply; Distribution & Roxborough Supply; Source, Pumping Station] [Page 8, also identified as Page 17] [Continuation of 2009.002.0065]
  3. Plate XVI - Percentages of increase of population of several cities by decades with probable rates of future increase for the City of Philadelphia; Probable increase of population of Philadelphia; Per capita water consumption of various cities; Growth of various cities (data from U.S. Census)

Commission on the Extension and Improvement of the Water Supply of the City of Philadelphia, Rudolph Hering, Joseph M. Wilson, Samuel M. Gray, 1899
  4. Plate VIII - Typical aqueduct sections:  section in earth excavation, section in rock excavation, tunnel in solid rock, section in embankment, tunnel section brick lined.

Commission on the Extension and Improvement of the Water Supply of the City of Philadelphia, Rudolph Hering, Joseph M. Wilson, Samuel M. Gray, 1899

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