Martian Time-Slip by Philip K. Dick

1976 2nd US printing from Ballantine in very good condition. Stamps on page ends. There's a cool fold-out ad in this one. 
 
On the arid colony of Mars the only thing more precious than water may be a ten-year-old schizophrenic boy named Manfred Steiner. For although the UN has slated "anomalous" children for deportation and destruction, other people--especially Supreme Goodmember Arnie Kott of the Water Worker's union--suspect that Manfred's disorder  may be a window into the future. In Martian Time-Slip Philip K. Dick uses power politics and extraterrestrial real estate scams, adultery, and murder to penetrate the mysteries of being and time.