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MLA
Trade card for W.J. Knowlton, minerologist and naturalist, No.168 Tremont Street, Boston, Mass., undated. n.d. Web. 24 Apr 2024. <http://gusn.us/242870>.
APA
Trade card for W.J. Knowlton, minerologist and naturalist, No.168 Tremont Street, Boston, Mass., undated [Card]. (n.d.). Retrieved from http://gusn.us/242870
Chicago
"Trade card for W.J. Knowlton, minerologist and naturalist, No.168 Tremont Street, Boston, Mass., undated." Card. Digital Commonwealth, http://gusn.us/242870 (accessed April 24, 2024).