Published References

• Engelhardt, George Washington, Philadelphia Pennsylvania, The Book of Its Bourse & Co-operating Bodies, Philadelphia, Lippincott Press, 1898-99., p. 272
  Links: View citation information
  Client/Project Name: C. E. Robinson & Bro., Gray's Ferry Printing Ink Works
   

Drawings, Photos, Papers, etc.

• Free Library of Philadelphia Map Collection - Hexamer General Surveys
  Holding Name: Robinson & Brother / Gray's Ferry Printing Ink Works
  Call Number: HGSv15.1394 (Vol. 15, Plate 1394)
   
• Free Library of Philadelphia Map Collection - Hexamer General Surveys
  Holding Name: Robinson & Pratt / Gray's Ferry Printing Ink Works
  Call Number: HGSv7.0625 (Vol. 7, Plate 625)
   

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