1. Copper Ingot;Federal Specification QQ-C-521d,21962
2. American Soc. for Testing and Materials, Standard Specification for Fire-Refined Copper for Wrought Products and Alloys, Designation B216-72.
3. American Soc. for Testing and Materials, Chemical Analysis of Metals; Sampling and Analysis of Metal Bearing Ores, Designations E-36-45, E-54-72, and E-62-72.