@misc{1162861,
  author = {T E Gills and R Mavrodineanu},
  title = {Standard Reference Materials ::Summary of the coal, ore, mineral, rock, and refractory standards issued by the National Bureau of Standards/},
  year = {1985},
  month = {1985-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.260-97},
  language = {en},
}