@misc{1167736,
  author = {Sidney H Greenfeld and Shigeru Ishihara},
  title = {Stain indices of twenty-one asphalts ::first supplement to NBS Report no. 4732 report on the evaluation of twenty-one coating-grade roofing asphalts},
  year = {1957},
  month = {1957-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.5224},
  language = {en},
}