----------------------------Original message----------------------------
Contact the   US/Mexico Border Info. Cntr.
              International Boundry and Water Comm.
              US Section
              4171 N. Mesa St.
              C-310
              El Paso, Tx.  79902
              Phone   915  534--6700
 
They should be able to help with your request.
 
John Shanton
USGS-ESIC
Reston, Va.