孤こ本ほん

noun

only extant copy; sole surviving copy

Used for a book or manuscript of which no other copies are known to exist. Often encountered in bibliographic or antiquarian contexts.

• この図と書しょ館かんには、世せ界かいで唯ゆい一いつの孤こ本ほんが所しょ蔵ぞうされている。

  This library holds the only extant copy in the world.