tutorial

Hello

I'm starting to deal with Xgrass.
I would like to know if there's some tutorial about it and where
I could obtain the document. I've downloaded the refman.ps file
from ftp.cecer.army.mil but it's only a reference guide of all
the programs.
Thanks in advance for the help.
Bye

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Stefano Iacovella MC7183@mclink.it