"View of the Insane Asylum, Now Building at Northampton, Massachusetts, " from Ballou's Pictorial Drawing-Room Companion, v. XI, no. 9 (August 30, 1856), p. 131.
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Use scholarly encyclopedias and dictionaries, such as those below, for an overview of your topic, definitions, a list of suggested readings, and (sometimes) a lead on related primary source material.