Importing and Handling DXF Map files in R

Hello, I am a newby in the filed of spatial data analysis, could you please 
point me to the right libraries/functions in R  that allow me to import DXF 
maps  and analize spatial data related to these maps ?
I would appreciaiate any internet references or books  that may give a good 
hands-on introduction to spatial data analysis, I have good knowledge of 
classical statistical methods.
 I need to analyze about 75000 data points scattered on a map area and I'd like 
to construct a "density" map of my variable of interest and eventually see how 
these densities change in time.

Thank you very much for your help.

Francisco J. Aguirre
Bavaria, Bogota -  Colombia.




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