LINGO LIBRARY · 18751A text-book of assaying : $b for the use of those connected with mines.✳Beringer, C. (Cornelius) · Beringer, J. J. (John Jacob)ENB1 · GeschätztA text-book of assaying : $b for the use of those connected with mines.Beringer, C. (Cornelius) · Beringer, J. J. (John Jacob)