Say, T., and G. Ord. 1825. Description of a new species of Mammalia, whereon a genus is supposed to be founded. Journal of the Academy of Natural Sciences of Philadelphia 4(2), 352–355. ( BHL link) Say, T. 1827. On the species of the Linnaean genus Echinus, inhabiting the coast of the United States. Journal of the Academy of Natural Sciences of Philadelphia 5(2), 225–228. ( BHL link) This book portrays, probably as vividly as any book ever will, the New Harmony community during the years Thomas Say lived there, as well as the far-flung ties between the little town and Philadelphia—and many other places in the world. At New Harmony, Thomas Say carried on his monumental work describing insects and mollusks, leading to two classic works: Thomas Say, American Entomology, or Descriptions of the Insects of North America, 3 volumes, Philadelphia, 1824-1828.

During their years in New Harmony both Thomas Say and naturalist Charles-Alexandre Lesueur experienced considerable difficulties. Sorely needed scientific equipment, publications, and correspondence were often much delayed. The problem was brought to the attention of William Maclure, who wrote from Mexico in June 1831 to Reuben Haines, contrasting the conditions for the two naturalists in the two locations. Say, T. 1823. Descriptions of Dipterous insects of the United States. Part 2. Journal of the Academy of Natural Sciences of Philadelphia 3(1), 73–104. ( BHL link) Say, T. 1830. Description of new North American Hemipterous insects. Part 1. Journal of the Academy of Natural Sciences of Philadelphia 6(2), 235–244. ( BHL link) Say, T. 1827. Descriptions of new species of Coleopterous insects inhabiting the United States. Part 2. Journal of the Academy of Natural Sciences of Philadelphia 5(2), 237–283. ( BHL link)Say, T. 1818. An account of the Crustacea of the United States. Part 8. Journal of the Academy of Natural Sciences of Philadelphia 1, 423–441. (Read June 10, 1818) ( BHL link) American Conchology, or Descriptions of the Shells of North America Illustrated From Coloured Figures From Original Drawings Executed from Nature, Parts 1–6, New Harmony, 1830–1834; Part 7, Philadelphia, 1836.

Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. ("Say", p. 234). Say, T. 1817. On a new genus of the Crustacea, and the species on which it is established. Journal of the Academy of Natural Sciences of Philadelphia 1(4), 49–52. (Read July 8, 1817) (BHL link) Say died, apparently from typhoid fever, in New Harmony on 10 October 1834, when he was 47 years old. Say, T. 1817. Description of seven species of American fresh water and land shells, not noticed in the systems. Part 1. Journal of the Academy of Natural Sciences of Philadelphia 1(1), 13–16. ( BHL link) Thomas Say was born in Philadelphia and, as a self-taught naturalist, at the age of 25 became a charter member of the Academy of Natural Sciences of Philadelphia. Living frugally in the Academy building, Say took care of the museum there and became a friend of William Maclure, President of the Academy from 1817 to 1840.Mawdsley, Jonathan R. (1993). "The Entomological Collection of Thomas Say". Psyche: A Journal of Entomology. 100 (3–4): 163–171. doi: 10.1155/1993/59616. Say, T. 1818. Observations on some of the animals described in the account of the Crustacea of the United States. Journal of the Academy of Natural Sciences of Philadelphia 1, 442–444. ( BHL link) Le Conte, John, ed. (1859). Complete Writings of Thomas Say on the Entomology of North America (two volumes). New York: Bailliere Brothers. Say, T. 1817. Description of seven species of American fresh water and land shells, not noticed in the systems. Part 2. Journal of the Academy of Natural Sciences of Philadelphia 1(2), 17–18. ( BHL link) Maclure wrote that Lesueur had essentially worked for free at the Academy and that the circulation of the Academy's journal was probably less than that of the Disseminator, published in New Harmony.