"Almost every lamppost in Central Park has an embossed label that displays a four-digit number. The first two numbers indicate the closest cross street in Manhattan, and the second two numbers are oriented to either the east or west side of the Park (odd numbers are closer to the west side, and even numbers are closer to the east side). For example, lamppost number 7314 indicates that the closest cross street to you is 73rd Street, and the 14 indicates that you are standing near the east side of the Park. The labels on lampposts located from 100th to 110th Streets still have four digits, but they drop the first digit (number one). Thus, lamppost 0107 is nearest 101st Street (01), and the 07 indicates that you are closer to the west side."
We do, however, own another wonderful book by Ms. Miller about Central Park, Central Park, an American Masterpiece.