LONDON UNDERGROUND tube map. Under construction to Heathrow. GARBUTT #3 1977

The extension to Heathrow Central is shown as being under construction, opening late 1977. Title of map:'London Transport - Diagram of lines - Number 3 1977 [9.77/2680M/750,000]'. London Transport - Diagram of lines - Number 3 1977 [9.77/2680M/750,000].

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