Indispensable to any walking tour of Gotham is the AIA Guide to New York City , a thorough survey of the city’s buildings put out by the New York Chapter of the American Institute of Architects (Collier Books). It is available in bookstores, but the more specific histories of Wall Street the author recommends must be retrieved from libraries: Robert Sobel’s The Big Board (The Free Press, 1965) covers the story of the stock market in entertaining detail; Money Town , by Frederick L. Collins (Putnam, 1946), is a general history of the Manhattan Toe from Henry Hudson’s discovery of the island to the days of illusory prosperity before the crash.