Article Sian Zelbo (2019)
The Recreational Mathematics Activities of Ordinary Nineteenth Century Americans: A Case Study of Two Mathematics Puzzle Columns and Their Contributors. British Journal for the History of Mathematics (pp. 155-178). (/isis/citation/CBB968000529/) unapi

Article Karen Reeds (2015)
Houses No Warmer than Barns: Peter Kalm on Fireplaces and Firewood in Colonial Pennsylvania. The Pennsylvania Magazine of History and Biography (pp. 349-352). (/isis/citation/CBB729164750/) unapi

Thesis Brandt, Susan Hanket (2014)
Gifted Women and Skilled Practitioners: Gender and Healing Authority in the Delaware Valley, 1740--1830. (/isis/citation/CBB001567636/) unapi

Article Grettler, David (2001)
The Nature of Capitalism: Environmental Change and Conflict over Commercial Fishing in Nineteenth-Century Delaware. Environmental History (p. 451). (/isis/citation/CBB000101037/) unapi

Article Pursell, Carroll W. (1959)
The Delaware iron works: A nineteenth century rolling mill. Delaware History (pp. 294-309). (/isis/citation/CBB001180273/) unapi