David A. Aguilar

Alien Worlds: Your Guide to Extraterrestrial Life (Science & Nature)

By David A. Aguilar

National Geographic Little Kids First Big Book of Space (First Big Books) (National Geographic Kids)

By Catherine D. Hughes, David A. Aguilar, Hughes, Catherine D.

13 Planets: The Latest View of the Solar System (Science & Nature)

By David A. Aguilar, National Geographic Kids