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Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. "John Hampden-Trevor, Lord Hampden to Mrs. Porter, franking signature on letter cover (empty)" The New York Public Library Digital Collections. 1804. https://digitalcollections.nypl.org/items/f2d936f0-c87e-0139-a3b6-0242ac110003
Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. "John Hampden-Trevor, Lord Hampden to Mrs. Porter, franking signature on letter cover (empty)" New York Public Library Digital Collections. Accessed February 6, 2025. https://digitalcollections.nypl.org/items/f2d936f0-c87e-0139-a3b6-0242ac110003
Carl H. Pforzheimer Collection of Shelley and His Circle, The New York Public Library. (1804). John Hampden-Trevor, Lord Hampden to Mrs. Porter, franking signature on letter cover (empty) Retrieved from https://digitalcollections.nypl.org/items/f2d936f0-c87e-0139-a3b6-0242ac110003
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(text)
John Hampden-Trevor, Lord Hampden to Mrs. Porter, franking signature on letter cover (empty), (1804)|author=Digital Collections, The New York Public Library |accessdate=February 6, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>