Before revision: BENJAMIN LATROBE and the THOMAS VIADUCT, The Maryland Surveyor, September 2000,pp 20-28, [www.marylandsurveyor.org], accessed 6 April 2024 citing
After revision: page 162.BENJAMIN LATROBE and the THOMAS VIADUCT, The Maryland Surveyor, September 2000,pp 20-28, [www.marylandsurveyor.org], accessed 6 April 2024 citing