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The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Mentmore, the home of Lord Rosebery, whose eldest son, Lord Dalmeny, has just come of age." The New York Public Library Digital Collections. 1800 - 1910. https://old-digitalcollections.nypl.org/items/9cf721ac-9d81-35d7-e040-e00a18063251
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. "Mentmore, the home of Lord Rosebery, whose eldest son, Lord Dalmeny, has just come of age." New York Public Library Digital Collections. Accessed October 3, 2026. https://old-digitalcollections.nypl.org/items/9cf721ac-9d81-35d7-e040-e00a18063251
The Miriam and Ira D. Wallach Division of Art, Prints and Photographs: Print Collection, The New York Public Library. (1800 - 1910). Mentmore, the home of Lord Rosebery, whose eldest son, Lord Dalmeny, has just come of age. Retrieved from https://old-digitalcollections.nypl.org/items/9cf721ac-9d81-35d7-e040-e00a18063251
<ref name=NYPL>{{cite web | url=https://old-digitalcollections.nypl.org/items/9cf721ac-9d81-35d7-e040-e00a18063251 | title=
(still image)
Mentmore, the home of Lord Rosebery, whose eldest son, Lord Dalmeny, has just come of age., (1800 - 1910)
|author=Digital Collections, The New York Public Library |accessdate=October 3, 2026 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>