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Archival descriptionConstitution and rules of the Hydro Group; minutes of Hydro Group meetings,
Constitution and rules of the Hydro Group; minutes of Hydro Group meetings,
General correspondence relating to the Hydro Group, 1983-1986; copies of Tonnau/Waves, the Hydro Group newsletter, 1984-1986,
General correspondence relating to the Hydro Group, 1983-1986; copies of Tonnau/Waves, the Hydro Group newsletter, 1984-1986,
Miscellaneous study reports and questionnaires,
Miscellaneous study reports and questionnaires,