@article{DA,
      author = {Keuffel && Esser Co.},
      url = {http://digitalcollections.ohsu.edu/record/4643},
      title = {Slide rule},
      abstract = {ca. 1920's-1940's},
      number = {DA},
      doi = {https://doi.org/10.6083/M45T3HWN},
      recid = {4643},
      address = {1940},
}