The Door into Summer Robert A. Heinlein  

Waldo & Magic, Inc. Robert A. Heinlein  

Starship Troopers Robert A. Heinlein  

Citizen of the Galaxy Robert A. Heinlein  

Star Beast Robert A. Heinlein  

Space Cadet Robert A. Heinlein  

Tunnel in the Sky Robert A. Heinlein  

Time for the Stars Robert A. Heinlein  

Time Enough for Love Robert A. Heinlein  

Glory Road Robert A. Heinlein  

Bumblebee economics Bernd Heinrich  

Why We Run: A Natural History Bernd Heinrich