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O'Donoghue, D., & Fagan, P.  (2004, September 23). Poekrich [Pockrich], Richard (1696/7–1759), inventor of musical glasses and social and economic reformer. Oxford Dictionary of National Biography. Retrieved 30 Oct. 2020, from https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-22420.