Arthur Burks 
Lords of the Stratosphere [EPUB ebook] 

In five minutes he turned to Jeter with a queer expression on his face. ‘Well, ‘ he said, ‘what’s to do about it? What is it? It seems to be some solid substance approximately a quarter mile square. But it can’t be true! A solid substance just hanging in the air at ninety thousand feet! It’s beyond all imagining!’ ‘What man can imagine, man can do, ‘ replied Jeter…