A text-book of assaying : for the use of those connected with mines. by Beringer et al.

A text-book of assaying : for the use of those connected with mines.

Beringer, J. J. (John Jacob) & Beringer, C. (Cornelius)

A text-book of assaying : for the use of those connected with mines.

Beringer, J. J. (John Jacob) & Beringer, C. (Cornelius)