- 1Peter C. Welsh
United States patents 1790 to 1870 : new uses for old ideas
1965; S. 110 - 151 : Ill.
Patent; USA; Geschichte 1790-1870 - 2Peter C. Welsh
Woodworking tools 1600 - 1900
1965; S. 179 - 227 : Ill.
Holzbearbeitung / Werkzeug; Geschichte 1600-1900 - 3Peter C. Welsh
Tanning in the United States to 1850 : a brief history
Washington, D.C.: Smithsonian Institution 1964; 99 S. : Ill., graph. Darst.
Washington <DC> / Smithsonian Institution; USA; Gerberei