Which one or two books would you send through a portal into the past?
Short answerDetailed destroyer and carrier design histories would give interwar naval leaders explanations that remain useful after the timeline changes.
NotesThe selected pair is a modern study of British destroyer design and Norman Friedman's aircraft-carrier design history, both intended for Admiral Reginald Henderson. They explain why designs developed as they did rather than merely cataloging finished ships. That reasoning could accelerate British destroyer, carrier, radar, and fire-control development from 1933. A future war atlas would quickly become obsolete once the books began changing technology and events.