Query: Avalon Books books
Relevant documents:
The Languages of Pao
Wall of Serpents
Silver Canyon
Big Planet
Solomon's Stone
The Glory That Was
The Tower of Zanid
Collision Course (Silverberg novel)
The Duplicated Man
Palos of the Dog Star Pack
The Mouthpiece of Zitu
The Outlaws of Mars
Out of This World (Leinster book)
Alien Planet (novel)
Invaders from Rigel
The Wall of Serpents
City on the Moon
The Rim of Space
The Blue Barbarians
Hidden World (novel)