Henry Chandler Cowles, « The Ecological Relations of the Vegetation on the Sand Dunes of Lake Michigan. Part I.-Geographical Relations of the Dune Floras », Botanical Gazette, vol. 27, no 2, , p. 95–117 (DOI10.1086/327796, JSTOR2465177, S2CID84315469, lire en ligne)
jstor.org
Henry Chandler Cowles, « The Ecological Relations of the Vegetation on the Sand Dunes of Lake Michigan. Part I.-Geographical Relations of the Dune Floras », Botanical Gazette, vol. 27, no 2, , p. 95–117 (DOI10.1086/327796, JSTOR2465177, S2CID84315469, lire en ligne)
(en) Cassidy Randall The Story Behind Indiana's First National Park (rapport) (lire en ligne, consulté le )
semanticscholar.org
api.semanticscholar.org
Henry Chandler Cowles, « The Ecological Relations of the Vegetation on the Sand Dunes of Lake Michigan. Part I.-Geographical Relations of the Dune Floras », Botanical Gazette, vol. 27, no 2, , p. 95–117 (DOI10.1086/327796, JSTOR2465177, S2CID84315469, lire en ligne)
semanticscholar.org
Henry Chandler Cowles, « The Ecological Relations of the Vegetation on the Sand Dunes of Lake Michigan. Part I.-Geographical Relations of the Dune Floras », Botanical Gazette, vol. 27, no 2, , p. 95–117 (DOI10.1086/327796, JSTOR2465177, S2CID84315469, lire en ligne)