Need information about GPRS

Please try this link for a book:
http://depositfiles.com/en/files/277...eway.To.T.html

Regards,

Wiley - GPRS.in.Practice.A.Companion.to.the.Specifications .Nov.2004.ISBN0470095075.pdf
Artech - GPRS.For.Mobile.Internet.chm
Artech - GPRS.Gateway.To.Third.Generation.Mobile.Networks.p df
GPRS and 3G Wireless Applications - Professional Developer's Guide.pdf
Wiley - Multiple Access Protocols for Mobile Communications_GPRS UMTS and Beyond.pdf
Willey - GSM, GPRS and EDGE Performance - Evolution Towards 3G-UMTS.pdf

thanks

but the link is not work

Added after 18 minutes:

THANKS

THESE BOOKS IN THE INTERNET ?