@misc{indiciaed0230f08d559,
  title = {Cement and concrete materials},
  author = {E. F. Burchard and G. B. Richardson},
  year = {1908},
  doi = {10.3133/b340h},
  url = {https://pubs.usgs.gov/publication/b340H},
  note = {Source identifier: b340H}
}