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              BOONSTRA, O.W.A. 1988, Supply-Side Historical Information Systems. The Use of Historical Databases in a Public Record Office, paper pres- ented at the Cologna Computer Conference, Cologne, September 7th - 10th, 1988.
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              Boonstra, Onno W. (1990): A. Supply-Side Historical Information Systems. The Use of Historical Databases in a Public Record Office. In: Historical Social Re- search 15 (1). 66-71.
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              O.W.A. Boonstra (1990). 'Supply-side Historical Information Systems. The Use of Historical Databases in a Public Record Office', Historical Social Re- search 15: 66-71.
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