*[[Frederick Law Olmsted|Olmsted, Frederick Law]], 1856, describing Riversdale, estate of George and Rosalie Stier Calvert, Prince George's County, Md. (1856: 6) <ref>Frederick Law Olmsted. ''A Journey in the Seaboard Slave States: With Remarks on Their Economy'' (New York and London: Dix & Edwards and Sampson Low, Son & co., 1856), [https://www.zotero.org/groups/54737/items/itemKey/ABI26XGF view on Zotero].</ref>
:The kept grounds are very limited, and in simple but quiet taste...There is a [[fountain]], an ornamental [[dovecote|dove-coat]], and [[icehouse|ice-house]].
Changes - History of Early American Landscape Design