@article{DA,
      url = {http://digitalcollections.ohsu.edu/record/6867},
      title = {Starr-Edwards heart valves},
      abstract = {Digital scan of a 35mm slide. Black-and-white comparison  of three models of Starr-Edwards heart valves labeled  (left-right: A 1200, B 2300, and C 2310. Each is a  ball-and-cage style heart valve, Model 1200 has a plastic  ball and models 2300 and 2310 have metal balls. Models 2300  and 2310 have a cage completely covered in white mesh  cloth, while model 1200 has a cloth-covered ring only.},
      number = {DA},
      doi = {https://doi.org/10.6083/M4VQ31BV},
      recid = {6867},
}