H.L. Helmholtz (1821-1894) postal stamp released in West Berlin--1971 in Germany--1994.
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2003-09-09
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Pai-Dhungat JV, Parikh F. H.L. Helmholtz (1821-1894) postal stamp released in West Berlin--1971 in Germany--1994. Journal of the Association of Physicians of India. 2003 Sep; 51(): 886