@misc{1162931,
  author = {R W Seward and W C Webster and T E Gills},
  title = {Standard Reference Materials:Sampling, materials handling, processing, and packaging of NBS sulfur in coal standard reference materials},
  year = {1983},
  month = {1983-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.SP.260-84},
  language = {en},
}