Long Copy ads were especially successful in the days of print magazines and mail order.

Here are classic examples: http://robertrosenthal.typepad.com/.a/6a00d8341c511c53ef0120...

http://www.perrymarshall.com/images/micro_tv_breakthrough.jp...

http://copyquickstart.com/call/sugarman/homework/home_comput...

Sorry that the last one has just one of two-paged spread. All I got via Google.

EDIT to add: Oh, look at this, from the JS of JS&A fame:

http://succeedinyourpajamas.com/wp-content/uploads/2013/06/J...