TY  - BOOK
AU  - Allen,Milton Arthur
AU  - Butler,G.M.
TI  - Fluorspar,
T2  - [Arizona.  State bureau of mines]  Bulletin
AV  - TN948.F6 A4
U1  - 402(274)Ar4 
PY  - 1921///
CY  - Tucson, Ariz.
KW  - Fluorspar
N1  - At head of title: ... University of Arizona bulletin; Cover title; "Selected bibliography": p. 18-19
ER  -