Alan Nourse 
Gold in the Sky [EPUB ebook] 

YOU WILL MEET—
Greg Hunter. Test pilot—happy only when his life hung in the balance.
Tom Hunter. A pioneer—his frontier was hidden in test tubes.
Johnny Coombs. A prospector—he returned from the asteroids too soon.
Merrill Tawney. An industrialist—he sought plunder even beyond the stars.
Major Briarton. A government man—his creed was law and order.
They fought with whatever was handy, not bothering to figure the odds…