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The Global Positioning System: Reviews of Lower Cost Modernization Efforts and Risk Mitigation of GPS Disruptions – Nova Science Publishers
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GPS Modernization : Challenges and Military Implications by Marlin Mata and Robert J. Samuelson (2012, Hardcover) for sale online | eBay
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A Short History of GPS Modernization | Geo Week News | Lidar, 3D, and more tools at the intersection of geospatial technology and the built world
GAO-18-74, GLOBAL POSITIONING SYSTEM: Better Planning and Coordination Needed to Improve Prospects for Fielding Modernized Capab
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