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National MLS System. The National Association of Realtors (NAR) sponsors this system, which provides national coverage of real estate listings. It’s inclusiveness is limited by the fact that some local systems, some listing agents, and some sellers opt not to upload their data to it. It is also limited by the fact that the reduction of data from a myriad of local systems leads to some errors and to a reduction of the level of detail on each property listed on this system. Still, the system is very useful for comparing prices around the country or for getting a preliminary read on property prices in your target area.