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Want to take a deep look at two London locations? Then pick up the
Holiday Geology Guides: Greenwich and The Tower of London. The
amazing variety of materials used in construction is concisely described and
located on perspective water colours. The hard, boring stuff under your feet
miraculously emerges as ancient Bushveld gabbro or Bardiglio marble—or
ground dinosaurs trod. Published by Earthwise (BGS), £1.95, ISBN 085272
327X and 3326.