Jay, thank you for your reply.
I get a lot of questions about seeds and now want to find out if there is a real good book that answers all the questions, so I can recommend that to people in the USA. I'm looking for a book that not only tells you how to save seeds, but also shows pictures of the plants, seeds and seedpods, And the same book must show how to collect, clean and store the seeds. And also tell you how to sow seeds, how long the seeds are viable etc. Everything that a beginner wants to know.
Your link is very useful, so thank you for that, but the book is not really for beginners and doesn't tell much about the other things beginners want to know. For me, it might be a very useful book to have in my collection.