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![Cover for John J. Wetter · The Impacts of Research and Development Expenditures: The Relationship Between Total Factor Productivity and U.S. Gross Domestic Product Performance - Innovation, Technology, and Knowledge Management (Paperback Book) [2011 edition] (2012)](https://imusic.b-cdn.net/images/item/original/438/9781461427438.jpg?john-j-wetter-2012-the-impacts-of-research-and-development-expenditures-the-relationship-between-total-factor-productivity-and-u-s-gross-domestic-product-performance-innovation-technology-and-knowledge-management-paperback-book&class=scaled&v=1570076343)
![Cover for John J. Wetter · The Impacts of Research and Development Expenditures: The Relationship Between Total Factor Productivity and U.S. Gross Domestic Product Performance - Innovation, Technology, and Knowledge Management (Hardcover Book) [2011 edition] (2010)](https://imusic.b-cdn.net/images/item/original/294/9781441975294.jpg?john-j-wetter-2010-the-impacts-of-research-and-development-expenditures-the-relationship-between-total-factor-productivity-and-u-s-gross-domestic-product-performance-innovation-technology-and-knowledge-management-hardcover-book&class=scaled&v=1570029114)