British Transport Commission: British Waterways
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BTC/BW engineering drawings
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BTC/BW engineering drawings 202-767
BW177/2/6/1/282
"Watford District, Apsley Section, proposed concrere piling between lock no 69 and lock no 71 Kings Langley"
Plans sections and summary table
1960
BW177/2/6/1/282
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