Craft Design and Technology in Context
by D. Williamson,T. Sharpe
ISBN 13: 9780582020351
Format: Paperback (96 pages) Publisher: Longman Published: 01 Aug 1988
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Water Treatment and Sanitation: A Handbook of Simple Methods for Rural Areas in Developing Countries
by H. T. Mann,D. Williamson
ISBN 13: 9780903031233
Format: Illustrated (100 pages) Publisher: Intermediate Technology Publications Published: 1982