Environmental Data and Hydrological Models - Queries

[C.E.Stocks]

Hello,
     Does anybody know whether public access is available
to the Indian Pine Natural Resources Laboratory Map Database, created 
and maintained by the Agricultural Engieering Department at Purdue 
University. 

    I understand that this database contains information that might 
be of value for providing parameters required by the AGNPS and 
ANSWERS distributed parameter models, is this the case?   

    Also, can anybody give the full reference description of the
'Answers User's Mannual, second addition', published in 1991. 

    Finally, does anyone know of a source for the SWRRB hydrological  
model (simulator of water resources for rural basins).

many thanks,

Chris Stocks.

p.s. I'm sorry for not mentioning GRASS in this meassage, but I am a 
user!