Matches in Library of Congress for { ?s ?p Principles of economics / Roy J. Ruffin, Paul R. Gregory.. }
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- 00063933 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".
- 85018307 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".
- 87023369 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".
- 89038873 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".
- 92023589 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".
- 96016568 title "Principles of economics / Roy J. Ruffin, Paul R. Gregory.".