OIL FLOW SLUMPS IN U.S.S.R.'S KEY PROVINCE
Oil flow in the Soviet Union's most prolific producing area, western Siberia's Tyumen province, apparently has plummeted to a level not seen since the early 1980s. There is no sign of an early rebound. Instead, Soviet officials are concerned that strike sentiment among Tyumen oil workers, which has been growing since last summer, may soon cause widespread work stoppages. If that happens, the U.S.S.R.'s 1990 oil flow could fall faster than production in the U.S.