History of Space Exploration: Chapter 2, Exercise 1 — Possible Solution
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FIGURES GIVEN
- V-2 article: 20,000 prisoners died during manufacturing (Mittelbau-Dora).
- V-2 and von Braun articles: about 12,000 labourers/prisoners died in
  production, against about 9,000 killed by V-2 attacks (BBC documentary,
  called disputed).

WHY NOT COMPARABLE
The 20,000 and 12,000 conflict, and the sources do not say whether one counts
the whole camp and the other only production. Both are second-hand and
disputed, and a comparison of deaths does not settle responsibility.