=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 11-JUN-91 :
Grindstone          970/034 RLR(1969) is 10.1m below BM T.S.1(1959)
=========================== BENCHMARK INFORMATION UPDATE ADDED  12-JUL-93 :
Grindstone          970/034 RLR(1969) is 10.1m below BM T.S.1(1959)

