@article{DA,
      recid = {6832},
      title = {Artificial heart valves},
      number = {DA},
      abstract = {Digital scan of a 35mm slide. Image of two ball-and-cage  style artificial heart valves, set side-by-side on a green  fabric background. One of the balls is clear while the  other is opaque plastic. The valve on the right shows signs  of having been implanted: tissue and blood stains cover  some of the white mesh cloth covering of the cage ring. A  ruler has been included for size comparison.},
      url = {http://digitalcollections.ohsu.edu/record/6832},
      doi = {https://doi.org/10.6083/M4CV4GC3},
}