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John Grayson has a large presence in the 1960's-1970's but there is very little direct traces of his work that can be found online today. He published at least two books Sound Sculpture 1) and Environments of musical sculpture you can build: Phase 1 2)
1)
1975 B000THEUDC https://www.amazon.com/dp/B000THEUDC/
2)
1976 ISBN 978-0889850019 https://www.amazon.com/dp/0889850011/
