 What did Tolliver tell Betty that was actually true?
On the bulletin board, Tolliver's name stood out beside the number of one of the airtight tractors used between the dome city and the spaceport, or for hauling cross-country to one of the mining domes. "Sure," agreed Tolliver thinking, Ohmigod! He enlarged upon other dangers to be encountered on the satellite, taking care to impress the newcomer with the daredeviltry of John Tolliver, driver of "missions" across the menacing wastes between dome and port. "You can't prove anything," declared Jeffers hoarsely. He stared unbelievingly at Betty, and Tolliver thought he muttered something about "just landed." Tolliver, hardly thinking about it, expected the someone to be a secretary, but it turned out to be three members of Jeffers' headquarters staff.
 how much he's making to work on Ganymede
 he regularly drives armored vehicles on missions  the rock and ice slides kill people often  volcanic puffballs pop out through the frozen crust  how much he's making to work on Ganymede