The transport properties of disordered solids have been the subject of much work since at least the 1950% but with a new burst of activity during the 1980s which has survived up to the present day. There have been numerous reviews of a more or less specialized nature. The present review aims to fill the niche for a non-specialized review of this very active area of research.The basic concepts behind the theory are introduced with more detailed sections covering experimental results, one-dimensional localization, scaling theory, weak localization, magnetic field effects and fluctuations. This review was received in its present form in June 1993. 0034-4885/93/121469+96559.S0 @ 1993 1OP Publishing Ltd 1469 p c( exp(-cuR -B A ) .(4)

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