[R] R Package That Contains International Geomagnetic Reference Field (IGRF)

[Jason Rupert]

By any chance is anyone aware of an R package that contains a representation of the International Geomagnetic Reference Field (IGRF)?  
http://www.ngdc.noaa.gov/IAGA/vmod/igrf.html

I've tracked down some Fortran and C code for the IGRF-10, and possibly IGRF-11, and was hoping to avoid an awkward port.  

Thanks again for any feedback and leads provided.