This book presents new and significant research results on water resources which are sources of water that are useful or potentially useful to humans. They are important because they are needed for life to exist. Many uses of water include agricultural, industrial, household, recreational and environmental activities. Virtually all of these human uses require fresh water. Only 2.7 per cent of water on the Earth is fresh water, and over two thirds of this is frozen in glaciers and polar ice caps, leaving only 0.007 per cent available for human use. Fresh water is a renewable resource, yet the world's supply of clean, fresh water is steadily decreasing. Water demand already exceeds supply in many parts of the world, and as world population continues to rise at an unprecedented rate, many more areas are expected to experience this imbalance in the near future. The framework for allocating water resources to water users (where such a framework exists) is known as water rights.

The rapidly developing field of oceanography has necessitated the publication of a fifth edition of this classic textbook. The revised version provides an introduction to descriptive (synoptic) oceanography and contains updated information on topics such as the heat budget, instruments and in particular, the use of satellites. The sections on equatorial oceanography, sea-ice physics, distribution and El Nino have been completely rewritten. The book is further supplemented by text on thermohaline circulation, mixing and also coral reef oceanography.

Companion volume to Components and Sub-Assemblies Directory, providing access to 8000 manufacturers, agents and representatives of electronics systems and equipment. Entries include names of key managers, addresses, fax/telephone numbers, and pocket descriptions of manufacturing and sales programmes. There is also a product index to track the companies involved in any given business lines.