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1971, Smith N.J.
1971, Stevenson D.M.
1971, Stewart P.N.
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1971, Valmadra P.J. and Borgna P.
1971, White E.T and Batstone R.J.
1971, Wright D.J.
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1971, Beiske G.C.
1971, Chapman L.S.
1971, Crawford W.B.
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1970, Hale D.J. and Whayman E.
1970, Haysom M.B.C.
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1970, Kelly, GJ, WATER AND IRRIGATION
1970, Kenny, JF, AGRICULTURE
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1970, Hitchcock B.E.
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