Données statistiques /
Institut national de la statistique et des études économiques.

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Item Link Original Source
Limited (search only)   1961-63 University of Michigan
Limited (search only)   1962-1963 University of Illinois at Urbana-Champaign
Limited (search only)   1964-65 University of Michigan
Limited (search only)   1966-67 University of Michigan
Limited (search only)   1968-71 University of Michigan
Limited (search only)   1968-1969 University of Illinois at Urbana-Champaign
Limited (search only)   1970 1970 The Ohio State University
Limited (search only)   1970-1971 University of Illinois at Urbana-Champaign
Limited (search only)   1972 University of Michigan