@article{DA,
      recid = {6869},
      title = {Artificial heart valves},
      number = {DA},
      abstract = {Digital scan of a 35mm slide. Black-and-white image of two  flap-style artificial heart valves set against a black  background.},
      url = {http://digitalcollections.ohsu.edu/record/6869},
      doi = {https://doi.org/10.6083/M4M61HX5},
}