Which famous map product was originally rejected by the London Underground in 1931, but after being published independently, became so popular that the transit authority eventually adopted it as their official map?

Throughout history, certain maps have not only been geographical tools but also revolutionary products that transformed how we see and interact with the world. These cartographic innovations became branded products in their own right, with distinctive designs, marketing campaigns, and loyal customer bases. Test your knowledge about the business and product history behind these influential geographic innovations!

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Harry Beck's Tube Map (which prioritized clarity over geographic accuracy)
Phyllis Pearsall's A-Z Street Atlas (which was created after she got lost in London)
John Bartholomew's 'Layer Tinting' Relief Maps (which revolutionized elevation visualization)
Stanford's London Tourist Map (which introduced color-coded tourist attraction categories)