Engineering & Construction Documentation and photographs relating to the construction of and later alterations to St Fergus. The bulk of the material concerns the planning and construction, and initial operation of the Terminal (Phases I in 1977 and Phase II in 1978). This mostly comprises specifications, planning documentation and design manuals. The remainder of the material, reports and photographs, relates to the Phase III modifications made in the late 1980s to early 1990s. Phase III was prompted by the discovery of fields of richer gas requiring different treatment. 1973 - 1990