Another googling activity bring me to a new keyword "free cisco books", I ever read about professor who write book about cisco and upload it in internet. I forgot his name but I still remember the place :
lulu.com
yes, by typing cisco in search term I got a few result and the main thing is they have free download section .

Registration is simple, just entering email and password.
Here’s some link from lulu.com around cisco :
Interesting site, I just ordering multimedia book in amazon in ebook category. I think I can download the book after make payment. It just hardbook that I must wait for almost a month
I hope lulu.com collection will grow faster. So my next order will be placed on lulu.com
Any other source for cisco ebook?
P.S :
Cisco Books and Networking Resources Web Site
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i hope tp learn cisco sysytems