TY  - RPRT
TI  - Weight of Production of Emeralds, Rubies, Sapphires, and Tanzanite from 1995 Through 2005
AU  - Thomas R. Yager
AU  - W. David Menzie
AU  - Donald W. Olson
PY  - 2008
DO  - 10.3133/ofr20081013
UR  - https://pubs.usgs.gov/publication/ofr20081013
ID  - ofr20081013
ER  -