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This translation originally published (B63-17349), Thames & Hudson, Adapted from Knaurs Konzertfuḧrer'. Droemersche Verlagsanstalt, 1951.
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Concert guide : a handbook for music-lovers by Gerhart von Westerman. ISBN 0722190050. Published by Sphere Books in 1968. Publication and catalogue information, links to buy online and reader comments.