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1LlyfrCyhoeddwyd 1968“...Intermediate Technology Development Group...”
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3Llyfrgan Boyd, J. E. L. (John E. L.)“...Intermediate Technology Development Group...”
Cyhoeddwyd 1976
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9LlyfrCyhoeddwyd 1985“...Intermediate Technology Development Group...”
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10LlyfrCyhoeddwyd 1976“...Intermediate Technology Development Group...”
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11LlyfrCyhoeddwyd 1970“...Intermediate Technology Development Group...”
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17LlyfrCyhoeddwyd 1977“...Intermediate Technology Development Group. Water Panel...”
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18LlyfrCyhoeddwyd 1983“...Intermediate Technology Development Group...”
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19
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20Trafodyn Cynhadledd LlyfrCyhoeddwyd 1991“...Intermediate Technology Development Group...”