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1Atti del Convegno LibroPubblicazione 1987“...Regional Conference for Africa on Soil Mechanics and Foundation Engineering Lagos, Nigeria...”
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2Atti del Convegno LibroPubblicazione 1963“...Regional Conference for Africa on Soil Mechanics and Foundation Engineering Salisbury, Rhodesia...”
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3Atti del Convegno LibroPubblicazione 1967“...Regional Conference for Africa on Soil Mechanics and Foundation Engineering Cape Town, South Africa...”
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4Atti del Convegno LibroPubblicazione 1985“...Regional Conference for Africa on Soil Mechanics and Foundation Engineering...”