ヘレン・M・ダンカン
Duncan, Helen M. Trepostomata from the Traverse group of Michigan. Bozeman: Montana State University Press (1937).
Easton, W. H. and Duncan, Helen M. "Archimedes and its Genotype" Journal of Paleontology. SEPM Society for Sedimentary Geology. Vol. 27, No. 5 (Sep., 1953), pp. 737–741.
Williams, James Steele and Duncan, Helen. "Fluorspar deposits in western Kentucky, part 1: Introduction" Fluorspar deposits in western Kentucky.