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John Thelwall, Political Lecture No.1, On the Moral Tendency of a System of Spies and Informers
- The Literary Encyclopedia. Volume 1.2.1.06: English Writing and Culture of the Romantic Period, 1789-1837.
- Vol. editors: Robert Clark (The Literary Encyclopedia), Daniel Cook (University of Dundee), Daniel Robinson (Widener University), Emily Rohrbach (University of Durham)

