Allen E. Comeskey & Stuart A. Smith 
Sustainable Wells [PDF ebook] 
Maintenance, Problem Prevention, and Rehabilitation

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No one has recorded when well digging started, but surely humans imitated elephants in digging holes in the sand to access cooler water that didn’t make the children sick. Eventually, humankind began to redesign, maintain, and repair the wells they constructed, but when wells became "commodities" in the twentieth century, this maintenance ethic was

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语言 英语 ● 格式 PDF ● 网页 334 ● ISBN 9780849375774 ● 出版者 CRC Press ● 发布时间 2009 ● 下载 3 时 ● 货币 EUR ● ID 4111161 ● 复制保护 Adobe DRM
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