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\begin{description}
\item{}Lamich, D., M. Hall, Y. Kondratyeva, R. Govindaraju and E. Hartnett, 
       1996: Documentation of Observational Data Preparation for the Goddard 
       Earth Observing System (GEOS) Data Assimilation System. 
       {\em NASA Tech. Memorandum 104606}, {\em in preparation}.
 
\item{}Pfaendtner, J., S. Bloom, D. Lamich, M. Seablom, M. Sienkiewicz, 
       J. Stobie, A. da~Silva, 1995: 
       Documentation of the Goddard Earth Observing System (GEOS) Data 
       Assimilation System--Version 1.  
       {\em NASA Tech. Memo. No. 104606}, Vol. ~{\bf 4}, 
       Goddard Space Flight Center, Greenbelt, MD 20771. 
       Available electronically on the World Wide Web as
       {\tt ftp://dao.gsfc.nasa.gov/pub/tech\_memos/volume\_4.ps.Z}
 
\item{}Rew, R., G. Davis and S. Emmerson, 1993: 
       {\em NetCDF User's Guide, an Interface for Data Access}. 
       Unidata Program Center, University Corporation for Atmospheric 
       Research, Boulder, CO, 186pp.
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