Dear Ms. Thurlow,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located 29 record series created by the Naval Research Laboratory. For more information about these records, please email the reference units listed in the Catalog description. We were unable to locate references to the GRAB program or to Reid D. Mayo.
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We searched online and located a citation for the following article or chapter by him. This book is available through a number of online retailers, as well as several libraries. Wet were unable to locate a reference to a book written entirely by Reid D. Mayo.
Mayo, Reid D. "Conceiving the World's First Signals Intelligence Satellite." In Beyond Expectations -- Building an American National Reconnaissance Capability: Recollections of the Pioneers and Founders of National Reconnaissance, ed. Robert A. McDonald, 129-138. Bethesda, MD: American Society for Photogrammetry and Remote Sensing, 2002.
We also located the following citation for interviews of him. The citation does not include information about where the transcripts are held. They may still be in the custody of the Naval Research Laboratory Historian.
Allison, D.K. Transcript of interviews with Reid Dennis Mayo conducted by NRL Historian (June 1981): 279 pages.
We located a number of additional references to Reid D. Mayo and/or the GRAB program, including the following web pages.
We hope this is helpful. Best of luck with your family research!