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1Cyhoeddwyd 1992“...Dept. of Survey and Land Information,...”
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6Cyhoeddwyd 1995“...Reed in association with the Dept. of Survey and Land Information,...”
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7Cyhoeddwyd 1993“...U.S. Geological Survey ; Dept. of Survey and Land Information,...”
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8Cyhoeddwyd 1993“...U.S. Geological Survey ; Dept. of Survey and Land Information,...”
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9Cyhoeddwyd 1993“...U.S. Geological Survey ; Dept. of Survey and Land Information,...”
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10Cyhoeddwyd 1993“...U.S. Geological Survey ; Dept. of Survey and Land Information,...”
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11Cyhoeddwyd 1993“...U.S. Geological Survey ; Dept. of Survey and Land Information,...”
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