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The discovery by Green and Schwarz in 1984 that tendimensional superstring theory is anomalyfree and finite only if the YangMills gauge group is SO(32) or E8 x E8 has made the phenomenological possibilities of superstrings evident. Ths has resulted in a sudden surge of interest in superstrings unification. Since this fastdeveloping field is new to almost all theoretical physicist, this collection of basic pre1985 references should be very valuable. This two volumes contain over 1000 pages of reprints plus some introductory comments by J Schwarz.
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