Isaac Asimov & Janet Asimov 
Norby and Yobo’s Great Adventure & Norby and the Oldest Dragon [EPUB ebook] 

This eighth volume of the complete children’s sci-fi series features a history-obsessed admiral and trouble at a dragon’s birthday party.Norby and Yobo’s Great Adventure The illustrious Adm. Boris Yobo wants to travel through time to discover the origins of a treasured family heirloom. And since Norby is the only way to time travel, he and Jeff become Admiral Yobo’s companions on a supposedly innocent weekend trip that turns into a dangerous adventure. Norby and the Oldest Dragon Jeff Wells is feeling decidedly out of sorts, and not even the prospect of the Grand Dragon’s birthday party on the planet Jamyn can cheer him up. In fact, that’s part of the problem. Jeff had wanted to stay at the Space Academy for the weekend. Instead, his sometimes-bossy personal robot, Norby, is making him pack for what he is sure will be an adventure-free trip. Boy, does he turn out to be wrong!