Do warships still carry libraries for periods when they must operate under a communications blackout?
Short answer
Libraries were present on the warships personally visited, although that observation does not establish a fleetwide rule.
Notes
The only evidence offered is direct observation. The warships personally visited still carried libraries. That confirms the practice survives on at least some ships whose crews may spend time without outside communications. No ship class is named, so the evidence does not show how common or extensive these libraries are.