normalization of streams, digging and dampening ditches, laying sewerage, divers and gardening, channels, embankment protection, plastic wrap, tests, details Date: May 1963 Keywords: details, divers and gardening, digging and dampening ditches, canals, laying sewerage, normalization of streams, plastic wrap, trials, embankment protection

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Photo credit: © BNA Photographic / Alamy / Afripics
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