| Royal Asiatic Soc- Sesquicentennial Vol | G.P.S.H. | De Silva | 1995 | General |
| Royal Botanic Gardens, Peradeniya - Illustrated Guide | N/A | N/A | 1951 | General |
| Royal Botanic Gardens, Peradeniya, Ceylon | Dept of Agriculture | N/A | 1971 | General |
| Royal College Magazine 1973, 1974 & 1975 | Royal College, Colombo | N/A | 1975 | General |
| Royal College Prize Giving 1978 - Report of the Principal 1976-77 | Royal College | N/A | 1978 | General |
| Royal Colombo Golf Club 100 Years - 1879-1979 | Pam | Fernando | 1979 | General |
| Royal Tour, The | Neil | Ferrier | 1954 | General |
| Royal Visit to Ceylon - Decorations & Pandals Enroute | N/A | N/A | 1954 | General |
| Royal Wesley Centenary Cricket Match, 1993 | S. S. | Perera | 1993 | General |
| Royal-Thomian Century - Commemoration of 100 Years of Cricket | Gamini | Amaratunga | 1979 | General |
| Royal-Thomian Cricket Centenary Issue 1880-1979 | Centenary Souvenir Committee | N/A | 1979 | General |
| Royalty in Ancient Ceylon, During the Period of the "Great Dynasty" | John M. | Seneveratne | 2005 (1918) | History |
| Rubber - Process of Manufacture | Henry S. | Thomas | 1962 | General |
| Rubber and Rubber Reserach in Ceylon | H.E. | Young | N/A | General |
| Rubber Goods Industry in Sri Lanka, The | Industrial Development Board | N/A | 1979 | General |
| Rubber Producing Companies, 1910 - 1911 | N/A | Gow, Wilson & Stanton Ltd | 1911 | General |
| Rubber Research In Ceylon | N/A | N/A | 1918 | General |
| Rugby Across The Straits | Neil | Wijeratne | 1999 | General |
| Ruhuna - A Study of its History, Society & Ideology | C.A. | Chandraprema | 1989 | General |
| Ruhuna An Ancient Civilisation Re-Visited - Numismatic & Archaeological Evidence on Inland & Maritime Trade | Osmund | Bopearachchi | 1999 | History |
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