What year did these dinosaurs take a trip on one of New York City's rivers? Put your best guess in the comments, and we'll update with the answer, and more, later.
UPDATE: This photo (now seen in full, above) was taken in 1963, on the Hudson River headed for the 1964 World's Fair (as many of you guessed!). You can purchase The Exciting World of Dinosaurs booklet from the fair on eBay—no bidders yet, and just 50 cents! Below is some video from the World's Fair, you'll catch the dinosaurs around the 7:40 mark: