LIBRARY

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Examining the conceptual design process for future hybrid-electric rotorcraft

Reed A. Danis, Author ; Michael W. Green, Author ; Jeffrey L. Freeman, Author ; David W. Hall, Author | [S.l.] : National Aeronautics and Space Administration | NASA CR | 2018

E-resource

Solar electric propulsion concepts for human space exploration

Carolyn R. Mercer, Author | [S.l.] : NASA | NASA TM | 2016

E-resource