1. 1
   The first annual report of the acting committee of the Society for the promotion of internal improvement in the Commonwealth of Pennsylvania

   Cyhoeddwyd 1826

   Philadelphia: Printed by Joseph R.A. Skerrett. 1826.

   [3], 4-45 p.,1 l. 22 cm.

   “...Pennsylvania Society for the Promotion of Internal Improvements in the Commonwealth...”
   

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2. 2
   Brief view of the system of internal improvement of the state of Pennsylvania; containing a glance at its rise, progress, retardation,--the difficulties it underwent,--its present...

   gan Carey, Mathew, 1760-1839
   Cyhoeddwyd 1831

   Philadelphia, Printed by L. Bailey, 1831.

   36 p. 22 cm.

   “...Pennsylvania Society for the Promotion of Internal Improvements in the Commonwealth...”
   

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3. 3
   Reports on canals, railways, roads, and other subjects, made to "The Pennsylvania Society for the Promotion of Internal Improvement."

   gan Strickland, William, 1787-1854
   Cyhoeddwyd 1826

   Philadelphia, H. C. Carey & I. Lea, 1826.

   vi, 51 p. illus., 57 pl. (part col., part fold.) map. 28 x 46 cm.

   “...Pennsylvania Society for the Promotion of Internal Improvements in the Commonwealth...”
   

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