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  1. 1

    Principles of economics by Gregory, Paul R., Ruffin, Roy J.

    Published 1993
    Book

    Principles of economics
  2. 2

    Principles of economics by Ruffin, Roy J., Ruffin, Roy J.

    Published 1983
    Book

    Principles of economics
  3. 3

    Principles of economics by Ruffin, Roy J.

    Published 1983
    Book

    Principles of economics
  4. 4

    Principles of economics by Ruffin, Roy J.

    Published 1983
    Book

    Principles of economics
  5. 5

    Principles of economics by Ruffin, Roy, 1938-

    Published 1983
    Book

    Principles of economics

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