@article{DA,
      url = {http://digitalcollections.ohsu.edu/record/7038},
      title = {X-ray of heart valves, pre- and post-operation},
      abstract = {Black and white photograph of an x-ray showing the  location of three heart-valves in a patient, pre-operative  and post-operative views.},
      number = {DA},
      doi = {https://doi.org/10.6083/M4N878GQ},
      recid = {7038},
}