"The Workshop and the Classroom: Philadelphia Engineering, the Decline of Apprenticeship and the Rise of Industrial Training, 1878-1900," History of Education Quarterly 39 (Summer, 1999): 143-160

"Re-assessing Henry Carey (1793-1878): The Problem of Writing Political Economy in Nineteenth- Century America," Journal of American Studies 34 (December 2000), 465-485.

'Northern Manufacturers and the Coming of the American Civil War, 1850-1861', in Keith Flett and David Renton (eds.), New Approaches to Socialist History (Cheltenham: New Clarion Press, 2003).

Lives of the Philadelphia Engineers: Capital, Class and Revolution, 1830-1890 (Aldershot: Ashgate, 2004).