<p>INTRODUCTION</p> <p>Selling by mail can be the easiest and least expensive method of selling your services or commodities. It can also be the most difficult and the most expensive method of doing the job. It all depends on the method you use in presenting your offering to your prospects; it depends on the kind of a letter you send to them.</p> <p>To write such a letter, a message that explains concisely yet completely and in an action-compelling manner what you have to offer, is a job that demands the services of an expert versed in every one of the thousand phases of selling and one with many years of successful mail order experience at his command.</p> <p>If you would choose the one man in the United States who could write for you a sales letter that would produce the results you desire, you would probably ask Robert Collier to do the job. Backed by many years of success in the field of selling by mail, selling every commodity from trench machinery to fertilizers, ebooks and raincoats, stocks and bonds and services, he has placed hundreds of millions of dollars into the pockets of the clients for whom he has written his master sales letter. As a consequence, he is today, America's premier writer of successful selling letters.</p> <p>We asked Mr. Collier to select from the many thousands of sales letters considered the best of them all. It was a difficult job to pick fifteen of the best from a list of ten thousand of the best. but the job is finished and here are the