http://images.google.com/imgres?imgurl=http://gis.nwcg.gov/giss_2006/job_aids/maps_and_graphics/USA_PLSS_Meridians_map.jpg&imgrefurl=http://gis.nwcg.gov/giss_2006/cd_contents.html&usg=__6fwSrzU16-Z48U9DJZUVEjApsv8=&h=1095&w=1595&sz=812&hl=en&start=4&um=1&tbnid=kcYAKM5FpuL4SM:&tbnh=103&tbnw=150&prev=/images%3Fq%3DPLSS%26hl%3Den%26client%3Dsafari%26rls%3Den%26sa%3DG%26um%3D1
PLSS maps covers most of the United States except the 13 original colonies and Texas. Everything else is considered "unsystematic". It has 34 principal meridians and baselines.
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