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"Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910 The New York Tunnel Extension of the Pennsylvania Railroad. The Cross-Town Tunnels. Paper No. 1158"

|Apr. 30, 1906. | 62 | 255 | 4.1 |
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Aug. 23, 1906. |Jan. 5, 1907. | 136 | 789 | 5.8 |
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Apr. 4, 1906. |Oct. 31, 1906. | 210 | 730 | 3.5 |
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Apr. 4, 1906. |Oct. 31, 1906. | 210 | 783 | 3.7 |
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Nov. 1, 1906. |Dec. 26, 1906. | 56 | 311 | 5.5 |
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Mar. 1, 1907. |July 23, 1907.


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