One Hundred Years of Echinacea angustifolia Harvest in the Smoky Hills sof Kansas, USA

Anderson, 1993, Before the wilderness: Environmental management by native Californians, 151

Anderson, 1997, Journal of Ethnobiology, 17, 149

Bailey, 1999, Social and economic impacts of wild harvested products

Bartholomew, 1999, Pioneer naturalist on the Plains: The diary of Elam Bartholomew, 1871 to 1934

Baskauf, 1994, American Journal of Botany, 81, 958

Binns, 2002, Systematic Botany, 27, 610

Blumenthal, 2000, HerbalGram, 49, 68

Blumenthal, 2001, HerbalGram, 51, 69

Blumenthal, 2006, HerbalGram, 71, 64

Boyd, 1997, Kansas Wildflower Society Newsletter, 19, 38

Brevoort, 1996, HerbalGram, 36, 49

Brevoort, 1998, HerbalGram, 44, 33

Chapman, 1994, Journal of the American Society for Horticultural Science, 119, 299

Crawford, 1998, North Dakota Outdoors, 61, 8

Felter, 1898, Eclectic Medical Journal, 58, 79

Flannery, 1999, Pharmacy in History, 41, 52

Fuller, 1991, Medicine from the wild: An overview of the U.S. native medicinal plant trade and its conservation implications

Godoy, 1993, Economic Botany, 47, 215

Hobbs, 1994, HerbalGram, 30, 33

Johnston, 1997, HerbalGram, 40, 52

Johnston, 1998a, HerbalGram, 41, 53

Johnston, 1998b, HerbalGram, 43, 61

Joyal, 1996, Economic Botany, 50, 446

Kindscher, 1989, Economic Botany, 43, 498

King, 1887, Eclectic Medical Journal, 42, 209

Klein, 1999, United Plant Savers Newsletter, 2, 18

Lantz, 1997, National Wildlife, June/July 1997, 12

Lloyd, 1897, Eclectic Medical Journal, 57, 421

Lloyd, 1904, American Journal of Pharmacy, 76, 15

McGregor, 1968, University of Kansas Science Bulletin, 48, 113

McGuffin, 2001, American Herbal Products Association AHPA Report, Winter, 2001

Milner-Guland, 1998, Conservation of biological resources, 10.1002/9781444313598

Patton, 1990, Qualitative evaluation and research methods

Richman, 1996, A wonderful year for herbs, 52

Richman, 1999, Whole Foods herbal product sales survey, 49

Robson, 1993, Real world research: A resource for social scientists and practitioner-researchers

Runk, 1998, Economic Botany, 52, 168

Samson, 1994, BioScience, 44, 418

Sayre, 1897, Transactions of the Kansas Academy of Science, 16, 85

Sayre, 1903, Transactions of the Kansas Academy of Science, 19, 209

Trager, 1998, Missouri Prairie Journal, 19, 6

Tyler, 1986, Economic Botany, 40, 279

Urbatsch, 2005, Flora of North America north of Mexico, vol. 21 of 26, 88

Weaver, 1935, Ecology, 16, 612