Strangely, many of Heisenberg's very important scientific papers are not translated into English.
For example, this one seems not to have been translated.
Where can I get the translated ones?
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It is not strange. They rarely translate papers in physics and mathematics from German or French into English. However two most important papers of Heisenberg and other founders of quantum mechanics are translated in the book B. L. van der Waerden, Sources on quantum mechanics, (there is a cheap Dover edition).