(4th, extended and edition with an appendix by Helmut Röhrl, ibid 1964, online text)
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(4th, extended and edition with an appendix by Helmut Röhrl, ibid 1964, online text)
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-23 from Wikipedia. The archived copy is preserved so this citation survives link rot.