Raper, George (1769 - 1797)
Natural History Museum, London: George Raper
Reid Henry, David Morrison (1919 - 1977)
Wikipedia: David Morrison Reid Henry
William R. Talbot: David Morrison Reid-Henry
Richter, Henry Constantine (1821 -1902)
Birds!
A Bird in the Hand
Cornell: Henry Constantine Richter
Rider, A.
Ridgway, John Livzey (1859 - 1947)
Wikipedia: John Livzey Ridgway
John Ridgway's Drawings for the Bendire Plates (PDF)
Ridgway, Robert (1850 - 1929)
Wikipedia: Robert Ridgway
Robert, Nicholas (1614 -1685)
Ruskin, John (1819 -1900)
Wikipedia: John Ruskin
Rutledge