1981 · قواعد بديلة (قواعد أساسية متغيرة)

The Book of Mars

A combat-system supplement for role-playing games, combining factual military data with event probabilities to support realistic combat resolution. It covers military technology and combat techniques from the archaic past through the near future, with rules that can also be used for miniature wargaming and small-scale infantry scenarios, whether historical or hypothetical.

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