https://books.google.com/books?id=MzOhCV21Q_0C&pg=PA44&lpg=PA44&dq=mertensia+virginica+virus&source=bl&ots=BFuDfmMlVG&sig=ACfU3U0UbPHj8mcjmrho63O6RyzwNYlM-Q&hl=en&sa=X&ved=2ahUKEwicw9Lz_vrmAhUumuAKHZZVBsgQ6AEwFnoECAoQAQ#v=onepage&q=mertensia%20virginica%20virus&f=false
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