TY  - RPRT
TI  - Index to the reflectance and microindentation hardness of ore minerals in the IMA/COM Quantitative Data File (first issue, 1977)
AU  - B. F. Leonard
PY  - 1979
DO  - 10.3133/ofr79658
UR  - https://pubs.usgs.gov/publication/ofr79658
ID  - ofr79658
ER  -