British Transport Commission: British Waterways
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BTC/BW engineering drawings
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BTC/BW engineering drawings 202-767
BW177/2/6/1/166
"Watford Dist. Apsley Section proosed concrete piling between lock No 83 Springwell and lock No 85 Harefield"
Plans and cross sections with summary of materials required
14 February 1958
BW177/2/6/1/166
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