@misc{1173581,
  author = {RE Gould},
  title = {Letter Circular 347::sundials},
  year = {1932},
  month = {1932-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.LCIRC.347},
  language = {en},
}