Ad Courtesy of Private Collection of Bradley Keen

Sixty years ago, before the days of Google and Wikipedia, Encyclopedia Britannica was the utmost authority on all things from Aardvarks to Zebras.  It was also during this time Encyclopedia Britannica was not only advertised in newspapers, but was also frequently the subject of a salesman’s knock at the door.

Unfortunately, book-bound reference is now a thing of the past, and Encyclopedia Britannica stopped publishing hardbound copies in 2010, when the page count had grown to over 32,000 and included 32 volumes.