The map marks places mentioned in Chapter 4 ‘New York: poems and stories’ in The Twentieth Century, including Brooklyn Bridge and the neighborhood of Harlem (including 135th Street Station, 8th Avenue, 5th Avenue, and Lenox Avenue).
The route shows the journey of Peter Martin in Jack Kerouac's The Town and the City through Port Chester, Mamaroneck, Larchmont, New Rochelle into the Bronx and Harlem. The journey continues along 110th Street, down 9th Avenue, across 59th Street and into Broadway ('The Great White Way') before reaching Times Square.