Matches in Library of Congress for { ?s ?p Pay-for-knowledge systems.. }
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- 00550778 subject "Pay-for-knowledge systems.".
- 2007459659 subject "Pay-for-knowledge systems.".
- 2009383387 subject "Pay-for-knowledge systems.".
- 2009503671 subject "Pay-for-knowledge systems.".
- 90037168 subject "Pay-for-knowledge systems.".
- 96091023 subject "Pay-for-knowledge systems.".
- 99047329 subject "Pay-for-knowledge systems.".