善本

shànběn
  1. old book
  2. good book
  3. reliable book
  4. rare book

CEDICT

fine edition (of a premodern text)

Wiktionary

版本学称最理想的本子。一般包括：一、时代最早或较早的本子。二、精印本。三、精钞本。四、手稿、写卷。五、名家精校的本子。六、海内外孤本。

重編國語辭典

Entry Composition

1 善 shàn
  1. good (virtuous)
  2. benevolent
  3. well-disposed
  4. good at sth
  5. to improve or perfect
2 本 běn
  1. (bound form) root; stem
  2. (bound form) origin; source
  3. (bound form) one's own; this
  4. (bound form) this; the current (year etc)
  5. (bound form) original
  6. (bound form) inherent
  7. originally; initially
  8. capital; principal
  9. classifier for books, periodicals, files etc

Related entries

古书 gǔshū
  1. ancient book
  2. old book
旧书 jiùshū
  1. second-hand book
  2. old book
  3. ancient book
这个商店卖旧书

This store sells old books.

Source: Tatoeba

秘籍 mìjí
  1. rare book
  2. cheat code (video games)