Copper wire card.

Bibliographic Details
Corporate Author:	United States. Bureau of Standards (Author)
Format:	Government Document eBook
Language:	English
Published:	Washington, D.C. : Bureau of Standards, 1919.
Series:	Miscellaneous publications (United States. Bureau of Standards) ; no. 17.
Subjects:	Electric wire > Standards. Electric conductivity.
Online Access:	https://purl.fdlp.gov/GPO/gpo70737

Available Online