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“printsandphotographs”, pp, nationallibraryofmedicine, nlm, imagesfromthehistoryofmedicine, ihm, historyofmedicinedivision, hmd, “nationalinstitutesofhealth”, nih, root, bulb, flower, stem, leaf, bookillustrations, herbals, pictorialworks, leaves, stalks, roots, plant, stillimage, foliage, engraving, butterflyweed, americanmedicalbotany, asclepias, medicinal, asclepiastuberosa, publicdomain, cytology, ecology, genetics, horticulture, morphology, botany, vegetation, naturalhistory, floristics, flora, phytogeography, plantlife, archivesofmedicine, nlmdigitalcollection
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