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/usr/share/ncarg/data/shp/mrb.prj is in libncarg-data 6.1.2-7.

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1
GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]