Paw Paw Tunnel
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Morris, Ellwood (1841): Ventilation of subterranean works, illustrated by practice at the pawpaw tunnel on the Chesapeake and Ohio canal. In: Journal of The Franklin Institute, v. 32, n. 1 (July 1841), pp. 23-25.
https://doi.org/10.1016/s0016-0032(41)91062-1
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Morris, Ellwood (1841): Ventilation of subterranean works, illustrated by practice at the Pawpaw tunnel on the Chesapeake and Ohio canal. In: Journal of The Franklin Institute, v. 31, n. 1 (January 1841), pp. 25-32.
https://doi.org/10.1016/s0016-0032(41)90896-7