@misc{1169861,
  author = {William C Cullen},
  title = {Guidelines for selection of and use of foam polyurethane roofing systems:},
  year = {1972},
  month = {1972-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.RPT.10963},
  language = {en},
}