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Helcké, George.
The energy saving guide : tables for assessing the profitability of energy saving measures with explanatory notes and worked examples / by George Helcké.
— 1st ed. — Oxford : Published for the Commission of the European Communities by Pergamon Press, 1981. xii, 224 p. ; 26 cm.
ISBN 0080267386. — ISBN 0080267394 (pbk.)
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