Boletin estadistico trimestral.

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Item Link Original Source
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Pennsylvania State University
Limited (search only)   Jan.-June 1971 Pennsylvania State University
Limited (search only)   July-Dec.1971 Pennsylvania State University
Limited (search only)   Jan.-June 1972 Pennsylvania State University
Limited (search only)   July-Dec.1972 Pennsylvania State University
Limited (search only)   Oct.1975-1976 Pennsylvania State University
Limited (search only)   Apr.-Dec.1977 Pennsylvania State University