The ore wagmas :
Spurr, Josiah Edward 1870,
The ore wagmas : A series of essays on ore deposition / By josiah Edward spurr. - 2 volúmenes
Yacimientos minerales
TN263 / S6
The ore wagmas : A series of essays on ore deposition / By josiah Edward spurr. - 2 volúmenes
Yacimientos minerales
TN263 / S6