Trying to find a magazine ad that featured the famous photo of the guys on an I-beam and then...?

The title the first of the following photographs "Lunch atop a Skyscr" or "Lunch at the top of a skyscr" The author is Charles C. Ebbets. He is one of the more solid photographers of the world. The photographs were taken in New York, on September 29th 1932, and published in the New York Herald Tribune in the Sunday supplement of the Oct. 2nd of that year. It was taken on the 69th floor of the 70that is the GE building in the Rockefeller Center.