Sites listed in this section contain sites with data other than just
weather information.  This includes map data, miscellaneous images,
atmospheric and oceanographic research data, and software for use
with meteorological data.  Primary data centers are listed first, 
followed by sites which may have some data of that type but are not 
necessarily official data centers.

Much of the research data is not free and is not directly available over 
the network; only metadata, or information about the data, is available,
and you must place an order for the actual data.