List of best-selling books

Columns: Book | Author ( s ) | Original language | First published | Approximate sales
Virgin Soil Upturned ( Поднятая целина ) | Mikhail Sholokhov | Russian | 1935 | 24 million copies in USSR | The Celestine Prophecy | James Redfield | English | 1993 | 23 million | The Fault in Our Stars | John Green | English | 2012 | 23 million | The Shack | William P. Young | English | 2007 | 22 million | Uncle Styopa ( Дядя Степа ) | Sergey Mikhalkov | Russian | 1936 | 21 million copies in USSR | The Godfather | Mario Puzo | English | 1969 | 21 million | Love Story | Erich Segal | English | 1970 | 21 million

Example questions:
What kind of scientist was the best-selling author with between 20 million and 30 million copies sold of Paul et Virginie ? | Which book did the best-selling author with between 20 million and 30 million copies sold of Lust for Life write about Michelangelo ? | What medical job did the best-selling author with between 20 million and 30 million copies sold of Who Moved My Cheese hold ?

Answers:
botanist | The Agony and the Ecstasy | physician