That is why he is still considered America's premier sales letter copywriter. In this audiocassette presentation, you'll see and hear the best of Mr. Collier's letters. How To Make A Fortune From Classified Ads. Classified advertising offers perhaps the greatest mail order income potential, for the least amount of money invested, of any advertising medium. But, to use classified advertising effectively, it is necessary to understand the peculiarities of this unique advertising form.
Some approaches work well.
Others simply won't work at all.