<p>The MBTA's map is one of the world's best, according to Mark Ovenden, transit and cartography expert. He joins Radio Boston to talk about his forthcoming book "Iconic Transit Maps: The World's Best Designs," and why he appreciates the T's map.</p>

The MBTA's map is one of the world's best, according to Mark Ovenden, transit and cartography expert. He joins Radio Boston to talk about his forthcoming book "Iconic Transit Maps: The World's Best Designs," and why he appreciates the T's map.

<p>The MBTA's map is one of the world's best, according to Mark Ovenden, transit and cartography expert. He joins Radio Boston&nbsp;to talk about his forthcoming book "Iconic Transit Maps: The World's Best Designs," and why he appreciates the T's map.</p>

The MBTA has one of the world's best maps, says transit cartography expert

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The MBTA has one of the world's best maps, says transit cartography expert

The MBTA has one of the world's best maps, says transit cartography expert

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