Basic Books:

Vraja-līlā
Easy Journey to Other Planets
Śrī Īśopaniṣad
Analogies
Bhagavad-gītā
Science of Self Realization
Perfect Questions Perfect Answers
Life comes from Life
Light of the Bhāgavata
Civilization and Transcendence
Kṛṣṇa
Stories told by Śrīla Prabhupāda