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Brockhaus-1911: Calculus
Eisler-1904: Calculus philosophicus
Herder-1854: Calculus Minervae · Calculus
Kirchner-Michaelis-1907: Calculus Minervae
Lemery-1721: Calculus humanus
Meyers-1905: Calcŭlus
Pierer-1857: Calcŭlus