Memoria y balance general /
Yacimientos Petrolíferos Fiscales.

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Item Link Original Source
Limited (search only)   1972-73,1975 University of Texas at Austin
Limited (search only)   1979-81 University of Texas at Austin
Limited (search only)   1982-85 University of Illinois at Urbana-Champaign
Limited (search only)   1989 University of Minnesota
Limited (search only)   1989-90 University of Texas at Austin
Limited (search only)   1990 University of Minnesota