=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Feb-1992
TG ZERO (1978-80) = ODN - 2.8M = ACD BUT NO KNOWN BM DETAILS
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 20-Sep-1994
Chatham: Munro gauge/stilling well
=========================== FOLLOWING PSMSL DOCUMENTATION ADDED 02-Jan-2001
Recent work on vertical land movements in the UK can be found from
the University of Nottingham web site:
http://ukcogr.iessg.nottingham.ac.uk/~eosi/