Discontinued OS symbols

Effective June 1, 2011, the following symbols have been discontinued.

OSZ AAIOF00 u 3 MA USD BBL Isthmus OSP Mexico-West Mthly

OSZ AAIOH00 u 3 MA USD BBL Maya OSP Mexico-USWC Mthly

OSZ AAIOE00 u 3 MA USD BBL Maya OSP Mexico-West Monthly

OSZ AAIOG00 u 3 MA USD BBL Olmeca OSP Mexico-West Mthly