If you have to take only two books on a desert island, these should be the ones:
A pair of vintage Videoton Musical Encyclopaedia D93, with look and size of regular encyclopedias. Videoton was big Hungarian audio/video company (it is active now, but in other OEM areas).
Inner works:
One 6.5cm cone tweeter and two 9cm "woofers" in sealed enclosure. Crossover consist of only one capacitor for the tweeter.
Nice little connectors on the back side:
Measured anechoic frequency response for both loudspeakers:
Not bad, after two (known!) total repairings (badly burned voice coils on all drivers). These are genuine bookshelf loudspeaker, so they
must be set up on a book-shelf (preferably between other books), against the wall, so the frequency response below 1 kHz will nicely fill up in level to match mid-high band.