@article{DA,
      url = {http://digitalcollections.ohsu.edu/record/6817},
      title = {Artificial heart valves},
      abstract = {Digital scan of a 35mm slide. Black-and-white side-by-side  comparison of two models of disc-type artificial heart  valves. On the left is "Model 6500" with stellite disc. On  the right is "Model 6520" with a disc of UHDP (ultra high  density plastic). Both models have metal cages with white  mesh cloth-covered rings.},
      number = {DA},
      doi = {https://doi.org/10.6083/M4B27SZB},
      recid = {6817},
}