 What was the number that Betty called?
The glowing semi-disk of Jupiter was more than half a million miles distant. It had been built for Ganymede, but not for Jeffers. Tolliver began to have his doubts the next day; which was "Tuesday" by the arbitrary calender constructed to match Ganymede's week-long journey around Jupiter. 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. He soon found that there was nothing for him to do but hang around the garage in case a spaceship should land. Sometimes there's no reason but them for sending a ship back with a crew instead of in an economy orbit. Under a portable, double-chambered plastic dome blown up outside the ship's airlock, a crewman helped him load two trunks and a collection of bags into the tractor. Trying already to be just one of the gang, instead of Lady Betty! Is her old man the treasurer, or does he just know where bodies are buried? They found they could send back loaded ships by 'automatic' flight—that is, a long, slow, economical orbit and automatic signalling equipment. "I'm retiring in six months if I'm still alive," he said bravely, edging the tractor into the airlock at their destination.
 To her Space Patrol colleagues
 To her Space Patrol colleagues  To the family’s private security team  To the Ganymede superiors  To Daddy’s private office at Koslow Space headquarters