Special sauce recommendations!

1. Underground Maps After Beck by Maxwell J. Roberts
2. Mr. Beck's Underground Map by Ken Garland
3. Cartographia: Mapping Civilizations by Vincent Virga
4. London's Lost Tube Schemes by Antony Badsey-Ellis
5. Maps: Finding Our Place in the World by John McCarter
6. London's Disused Underground Stations by James Edward Connor
7. No Need to Ask by David Leboff
8. London: A Life in Maps by Peter Whitfield
9. The Works: Anatomy of a City by Kate Ascher
10. Rolling Paper Graphics by Jose Lorente
11. The Great Society Subway: A History of the Washington Metro (Creating the North American Landscape) by Zachary M. Schrag
12. Subways of the World by Stan Fischler
13. Underground to Everywhere: London's Underground Railway in the Life of the Capital by Stephen Halliday
14. London's Secret Tubes by Andrew Emmerson
15. The London Underground by Douglas Rose
16. The Story of London's Underground by John Robert Day
17. Spread of London's Underground by Tim Demuth
18. Railway Stations: From the Gare De L'est to Penn Station by Alessia Ferrarini
19. A Logo for London by David Lawrence
20. What's in a Name? by Cyril M. Harris

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5. Subwayland: Adventures in the World Beneath New York by Randy Kennedy
6. Uptown/Downtown: A Trip Through Time on New York's Subways by Stan Fischler
7. The Works: Anatomy of a City by Kate Ascher
8. The Great Society Subway: A History of the Washington Metro (Creating the North American Landscape) by Zachary M. Schrag
9. Subways of the World by Stan Fischler
10. Mr. Beck's Underground Map by Ken Garland
11. The Island of Lost Maps: A True Story of Cartographic Crime by Miles Harvey
12. Subways: The Tracks That Built New York City by Lorraine B. Diehl
13. Building the Independent Subway by Frederick Kramer
14. Under the Sidewalks of New York: The Story of the Greatest Subway System in the World by Brian J. Cudahy
15. London Under London: A Subterranean Guide by Richard Trench

People with this book also have... (more obscure)

1. Subways of the World by Stan Fischler (expected 0.2, found 13)
2. Mr. Beck's Underground Map by Ken Garland (expected 0.5, found 23)
3. London: A Life in Maps by Peter Whitfield (expected 0.5, found 14)
4. Cartographia: Mapping Civilizations by Vincent Virga (expected 0.7, found 15)
5. The Works: Anatomy of a City by Kate Ascher (expected 1.6, found 32)
6. Subwayland: Adventures in the World Beneath New York by Randy Kennedy (expected 0.7, found 13)
7. The Subterranean Railway: How the London Underground Was Built and How It Changed the City Forever by Christian Wolmar (expected 0.8, found 14)
8. Infrastructure: A Field Guide to the Industrial Landscape by Brian Hayes (expected 1.1, found 16)
9. The Penguin Dictionary of Curious and Interesting Numbers by David Wells (expected 1.3, found 13)
10. Penguin by Design: A Cover Story 1935-2005 by Phil Baines (expected 1.4, found 14)
11. How the States Got Their Shapes by Mark Stein (expected 1.4, found 14)
12. You Are Here by Katharine Harmon (expected 2.2, found 21)
13. How to Lie with Maps by Mark Monmonier (expected 1.5, found 14)
14. City Life by Witold Rybczynski (expected 1.8, found 15)
15. How Buildings Learn: What Happens After They're Built by Stewart Brand (expected 3.3, found 20)