Can you tell me if there is a book that teaches you how to recognize seeds, how to collect seeds, how to clean seeds, how to store seeds, pictures of seeds and seedpods, longevity of seeds, sowing seeds, etc.
If there is a book that is helpfull, please tell me the title and author.
If you can’t find a book about seeds, please tell me what you want to learn about seeds.

I am sorry Jona, but I don't know of such a book, although I wish I knew of one

I don't know of any books, but these links have helped me:
http://theseedsite.co.uk/db1.h...
http://www.flickriver.com/phot...
http://www.theseedsite.co.uk/s...

I just realized you posted the same question in several places and I answered you twice.

Thank you Greene and Frostweed.
I did post the subject in several places, but the main discussion is here: The thread "Cleaning Showy Milkweed Seeds" in Seeds forum
Any suggestion or question is much appreciated

Maybe @dave could move all the answers to the multiple posts to one place? May I suggest grouping all the answers in the Ask a Question.

This is why it's best not to cross post a question to numerous forums. One thread per question is the right netiquette.