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The pdf maps can be found by going to the following link and selecting the appropriate region of interest.\nhttp://www.boem.gov/Oil-and-Gas-Energy-Program/Mapping-and-Data/Index.aspx\nBoth OPDs and LMs are further subdivided into individual Outer Continental Shelf(OCS) blocks which are available as a separate layer. Some OCS blocks that also contain other boundary information are known as Supplemental Official Block Diagrams (SOBDs.) Further information on the historic development of OPD's can be found in OCS Report MMS 99-0006: Boundary Development on the Outer Continental Shelf: \nhttp://www.boemre.gov/itd/pubs/1999/99-0006.PDF\nAlso see the metadata for each of the individual GIS data layers available for download. 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