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King, J.. "Echinacea angustifolia." Eclectic Medical Journal 42 (1887): 209-10. This marks the move from use as a traditional native medicinal herb, to being used by western medical practitioners.
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Medicinal plants of the Pacific Northwest : a digest of anthropological writings about Native American uses - page 97
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Government Document - Federal Register This is one piece of documentary evidence about the at risk status of echinacea.
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Richo Cech's book provides a wealth of information about preserving herbs through cultivation.
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Kindscher, Kelly. Echinacea. Cham: Springer International, 2016. Web. Google Books Preview