found: The schoolmasters assistant, 1796:t.p. (E. Duyckinck and Co.; bookseller)
found: History of book publishing in the United States, 1972-1981:v. 1, p. 194-195 (Evert Duyckinck; publisher for 40 years in New York City; founded a family of 19th century biographers and editors; d. 1833)
found: MWA/NAIP files, June 23, 2009(hdg.: E. Duyckinck and Co.; usage: E. Duyckinck and Co; Evert Duyckinck and Co.; Evert Duyckinck & Co.; E. Duyckinck & Co.; note: bookselling firm of Evert Duyckinck (1764?-1833) and others; active at New York, N.Y., 1794-98)
