A half century ago today, Sept. 16, 1974, Robert Caro published “The Power Broker,” his mammoth biography of Robert Moses, who dominated New York and its environs for 40 years building bridges, roads and parks. Today, an e-book version of the 1,300-page tome, which weighs more than 3 pounds, becomes available. When Caro first turned in his manuscript it topped a million words and he had to cut a third of it, including chapters on the years of Mayor Fiorello LaGuardia and Gov. Al Smith. We once suggested to Caro that he publish an unabridged edition and asked where the excised portions were. He said that they were in metal boxes in storage on Long Island. However, since 2019, the New-York Historical Society has the papers. Those missing pages could make a fine 600-page history book. How about it, Bob?