As might be expected, there is a direct correlation between the grandeur of a library building and the number of postcards that have depicted the library building. So it is not surprising that the Central Library of the Milwaukee Public Library which was completed in 1898 is depicted on a great many picture postcards. In my personal collection, I have over 20 different Milwaukee Public Library postcards. The year 1898 is significant in the world of postcards since this is the year that Congress authorized Private Mailing Cards that could be mailed at the one cent rate. Previously postcards required postage of two cents. This was the beginning of what is considered to be the golden age of picture postcards which lasted until the beginning of World War I. There is nothing special about the view of the Milwaukee Public Library on the postcard which is shown above. However, the address side of the postcard shows that this card was carried on the LZ127 Zeppelin air ship from Lakehurst, N. J. to Friedrichshafen, Germany and back. This make the postcard very special to philatelist who collect mail that has been flown on Zeppelins. The postcard below is an unusual double postcard which is twice the size of a standard postcard.