This book deals with harmonic analysis in a modern way including results not yet published in monograph form. It will be used by graduate students and researchers in mathematics, physics and engineering.nSummary of contents:nGroup Methods in Commutative Harmonic Analysis by V.P. Gurarii:nChapter 1. Convolution and Translation in Classical AnalysisnChapter 2. Invariant Integration and Harmonic Analysis on Locally Compact Abelian GroupsnReferencesnIndices