@misc{indiciaea993f85d9518,
  title = {The strength of concrete beams; results of tests of 108 beams, first series, made at the structural materials testing laboratories},
  author = {Richard Lewis Humphrey},
  year = {1908},
  doi = {10.3133/b344},
  url = {https://pubs.usgs.gov/publication/b344},
  note = {Source identifier: b344}
}