@misc{indiciae6235ec563201,
  title = {Lightweight aggregate production from claystone and shale in Bangladesh},
  author = {Norbert A. Parker and M.A. Khan},
  year = {1976},
  doi = {10.3133/ofr76163},
  url = {https://pubs.usgs.gov/publication/ofr76163},
  note = {Source identifier: ofr76163}
}