@article{DA,
      recid = {6856},
      title = {Artificial heart valve},
      number = {DA},
      abstract = {Digital scan of a 35mm slide. Image of an artificial heart  valve set on a green fabric background. Tissue has been  sewn into a mesh cloth-covered ring.},
      url = {http://digitalcollections.ohsu.edu/record/6856},
      doi = {https://doi.org/10.6083/M49022F1},
}