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  1. Hermannus Contractus Über das Astrolab.J. Drecker - 1931 - Isis 16 (2):200-219.
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  • Hermannus Contractus Über das Astrolab.J. Drecker - 1931 - Isis 16:200-219.
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  • Further astronomical material of Abbo of Fleury.Ron B. Thomson - 1988 - Mediaeval Studies 50 (1):671-673.
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