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Max Planck - Wikipedia
Max Planck | Biography, Discoveries, & Quantum Theory
Max Planck - Biography, Facts and Pictures - Famous Scientists
The official website of the Nobel Prize - NobelPrize.org
ESA - Max Planck: Originator of quantum theory - European …
Max Planck summary | Britannica
A Science Odyssey: People and Discoveries: Max Planck - PBS
Max Planck: Biography, Physicist, & Legacy
Max Planck (1858 - 1947) - Biography - MacTutor History of …
Who was Max Planck? - JSTOR Daily
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