Fletcher, Neville H.2020-10-160034-4885http://hdl.handle.net/1885/212536A review is given of the present state of structural knowledge about the water molecule, small molecular clusters, the various stable and metastable polymorphs of ice and liquid water. Mention is also made of `polywater' and of surface and interfacial structures. The discussion is restricted primarily to structural matters and the emphasis is upon work done since 1965.application/pdfen-AU© 1971 IOP Science197110.1088/0034-4885/34/3/303