1. The conservation importance of the machair system of the Scottish islands, with particular reference to the Outer Hebrides;Angus,1994
2. The Outer Hebrides – The Shaping of the Islands;Angus,1997
3. Soils of the British Isles;Avery,1990
4. Chlorites and hydroxy interlayered vermiculite and smectite;Barnhisel,1989
5. The nature and occurrence of sand-dune machair in Ireland;Bassett;Proc. R. Irish Acad. B,1985