@misc{indiciae626006d19d8f,
  title = {Methods and standards for environmental measurement : proceedings of the 8th Materials Research Symposium held at the National Bureau of Standards, Gaithersburg, Maryland, September 20-24, 1976 — Illustration, Page 523},
  year = {1977},
  url = {https://www.biodiversitylibrary.org/page/41747603},
  note = {Source identifier: page-41747603}
}