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Edgar, Graham K and Carr, K T and Page, J and Clarke, A L (1991) The effects upon visual performance of varying binocular overlap. Technical Report. DTIC. (Unpublished)
Gaskell, Peter and Tanner, M (1991) Agricultural change and environmentally sensitive areas. Geoforum, 22. pp. 81-90.
Hugenberger, Gordon Paul (1991) Marriage as a Covenant: A Study of Biblical Law and Ethics Governing Marriage Developed from the Perspective of Malachi. PhD thesis, University of Gloucestershire.