This is an amazing resource for ideas. It should be on every bookseller's bookshelf. I keep it handy for when I am hungry for creative ideas.
Like all of Nat Bodian's books, it's top quality and full of great information, packed with 59 chapters in 400 pages. While it is pre-Internet, you will be hard-pressed to find a more thorough treatment of the direct marketing topic.
This book is in the same league with John Kremer's "Book Marketing Made Easier" (bookmarket.com) and E Haldeman-Julius's "First Hundred Million" (100millionbooks.net). Both are PACKED with ideas, the latter also packed with proven sales numbers for what titles did and did not sell. Both are also out of print unfortunately. Kremer's book can be picked up used and is well worth the money. The other is available in digital format but is largely unavailable except for hundreds of dollars, if you can find it.
If you have a chance to pick up any of Bodian's books, do it! I love them.