What is light? [by] A. C. S. van Heel and C. H. F. Velzel; translated from the Dutch by J. L. J. Rosenfeld.
By: Heel, A. C. S. van (Abraham Cornelis Sebastien), 1899-1966. Heel, A. C. S. van (Abraham Cornelis Sebastien), 1899-1966.
Contributor(s): Velzel, C. H. F.
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