Operation Monkey | Somanader | Ceylon Today | 1966 | 15 | 10 | 12 - 17 | General |
Operational Research in the Health Services | Jayasinghe | Ceylon Today | 1964 | 12 | 6 | 10 - 19 | General |
Orange Headed Ground Thrush, An | Jinasena | Loris | 1988 | XVIII | 1 | 13 | General |
Orange Orchards in the Gal Oya Valley | Punchihewa | Ceylon Today | 1969 | XVIII | 3 & 4 | 42 - 45 | General |
Orchids of Ceylon, The | Soysa | Ceylon Today | 1954 | 3 | 3 & 4 | 9 - 15 | General |
Orchids of Ceylon, The | Kriekenbeek | Tourists' Ceylon | 1968 | 2 | 1 | 40 - 43 | General |
Oriental & Occidental Art | Howes | Ceylon Today | 1952 | 1 | 4 | 8 - 12 | General |
Orientation in Migrating Birds - A Mystery Remains | Samayawardhena | Loris | 1999 | 22 | 1 | 33 - 34 | General |
Origin & Development of Simhala Nadagam, The | Peiris | Journal of the Royal Asiatic Society | 1974 | XVIII New Series | N/A | 27 - 40 | General |
Origin & Early Development of Grammatical Studies in Sinhala, The | Jayawardhana | Journal of the Royal Asiatic Society | 1989/90 | XXXIV New Series | N/A | 65 - 77 | General |
Origin of the Kandyan Realm, The | Nell | Journal of the D.B.U. | 1962 | LII | 3 & 4 | 3 - 7 | History |
Origin of the Muturajawela Canal | Somaratne | University of Colombo Review | 1984 | 1 | 4 | 94 - 98 | General |
Origin of the Name Galle Face, The | N/A | Journal of the D.B.U. | 1963 | LIV | 1 - 4 | 59 | General |
Origin of the Sinhalese Language | Alwis | Journal of the Royal Asiatic Society | 1865-66 | IV | 13 | 143 - 156 | General |
Origin of the Sinhalese Language, The | Shahidullah | Journal of the Royal Asiatic Society | 1962 | VIII New Series | 1 | 108 - 117 | General |
Our Crocodiles - Why Protect Them ? | Farook | Loris | 1979 | XV | 1 | 45 - 46 | General |
Our Deer | Tutein-Nolthenius | Loris | 1977 | XIV | 3 | 147 - 149 | General |
Our Diminishing Wild Life | Norris | Loris | 1963 | IX | 5 | 277 - 284 | General |
Our Elephants | N/A | Ceylon Today | 1960 | 9 | 2 | 21 - 22 | General |
Our Elephants | de Alwis | Loris | 1969 | XI | 6 | 350 - 354 | General |
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