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• R-Rar
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• Rome-Rt
• Ru-Rz

• "Rail Splitter" - Dictionary of American History
• ‘Raindrop’ Prelude - The Concise Oxford Dictionary of Music
• R - World Encyclopedia
• R - Concise Oxford Companion to the English Language
• R - The Concise Oxford Dictionary of Music
• R - A Dictionary of the Bible
• r - The Oxford Dictionary of Abbreviations
• r - The Oxford Pocket Dictionary of Current English
• R & A - The Oxford Dictionary of Abbreviations
• R & B - The Oxford Pocket Dictionary of Current English
• R & D - The Oxford Pocket Dictionary of Current English
• r & m - The Oxford Dictionary of Abbreviations
• R & R - The Oxford Pocket Dictionary of Current English
• R 'n' B - The Oxford Dictionary of Abbreviations
• R 'n' R - The Oxford Dictionary of Abbreviations
• R 101 airship - The Oxford Companion to British History
• R 101 airship - A Dictionary of British History
• R association - A Dictionary of Astronomy
• R Canis Majoris star - A Dictionary of Astronomy
• R Coronae Borealis star - A Dictionary of Astronomy
• R factor - The Oxford Dictionary of Abbreviations
• R Lincolns - The Oxford Dictionary of Abbreviations
• R magnitude - A Dictionary of Astronomy
• R of O - The Oxford Dictionary of Abbreviations
• R plasmid - The Oxford Dictionary of Abbreviations
• r selection - A Dictionary of Biology
• R star - A Dictionary of Astronomy
• R technique - A Dictionary of Ecology
• R technique - A Dictionary of Plant Sciences
• R value - A Dictionary of Ecology
• R value - A Dictionary of Zoology
• R War. R - The Oxford Dictionary of Abbreviations
• R Wilts Yeo. - The Oxford Dictionary of Abbreviations
• Rābiʿa al-ʿAdawiyya - The Concise Oxford Dictionary of World Religions
• Rādhā - The Concise Oxford Dictionary of World Religions
• Rādhāsoāmī Satsȧg - The Concise Oxford Dictionary of World Religions
• Rāfiḍites - The Concise Oxford Dictionary of World Religions
• Rāg - The Concise Oxford Dictionary of World Religions
• Rāgī - The Concise Oxford Dictionary of World Religions
• Rāga - The Concise Oxford Dictionary of World Religions
• rāga - A Dictionary of Buddhism
• Rāhula - The Concise Oxford Dictionary of World Religions
• Rāhula - A Dictionary of Buddhism
• Rāhulabhadra - A Dictionary of Buddhism
• Rāhulamātā - A Dictionary of Buddhism
• Rāj karegā Khālsā - The Concise Oxford Dictionary of World Religions
• Rāja - The Concise Oxford Dictionary of World Religions
• Rāja-yoga - The Concise Oxford Dictionary of World Religions
• Rājacandra, Śrīmad - The Concise Oxford Dictionary of World Religions
• Rājagṛha - A Dictionary of Buddhism
• Rājagriha, Council of: - The Concise Oxford Dictionary of World Religions
• Rājasthān - Concise Dictionary of World Place-Names
• Rājkot - Concise Dictionary of World Place-Names
• Rājshāhi - Concise Dictionary of World Place-Names
• Rājya - A Dictionary of First Names
• Rākṣasa - The Concise Oxford Dictionary of World Religions
• rākṣasa - A Dictionary of Buddhism
• Rām Dās, Gurū - The Concise Oxford Dictionary of World Religions
• Rām Mohan Roy - The Concise Oxford Dictionary of World Religions
• Rām Rāi - The Concise Oxford Dictionary of World Religions
• Rām Si̇gh - The Concise Oxford Dictionary of World Religions
• Rāmānanda - The Concise Oxford Dictionary of World Religions
• Rāmānuja - The Concise Oxford Dictionary of World Religions
• Rāmāyaṇa - The Concise Oxford Dictionary of World Religions
• Rām(a)prasād - The Concise Oxford Dictionary of World Religions
• Rāma - The Concise Oxford Dictionary of World Religions
• Rāmañña - A Dictionary of Buddhism
• Rāmanāthapuram - Concise Dictionary of World Place-Names
• Rāmana Maharishi - The Concise Oxford Dictionary of World Religions
• Rāmdāsī - The Concise Oxford Dictionary of World Religions
• Rāmgaṛhīā - The Concise Oxford Dictionary of World Religions
• Rāmlīlā - The Concise Oxford Dictionary of World Religions
• Rānadé, Mahādev Govind - The Concise Oxford Dictionary of World Religions
• ṛddhi - A Dictionary of Buddhism
• ṛddhipāda - The Concise Oxford Dictionary of World Religions

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