TY  - BOOK
AU  - Pratt,Joseph Hyde
TI  - Corundum and its occurence and distribution in the United States (a rev. and enl. ed. of bulletin no. 180) by Joseph Hyde Pratt
T2  - U.S. Geological Survey. Bulletin
AV  - QE75 .B9 no. 269
PY  - 1906///
CY  - Washington
PB  - Gov't print. off.
KW  - Corundum
N1  - Issued also as House doc. no. 202, 59th Cong., 1st sess
ER  -