Category:Groningen constant
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Media in category "Groningen constant"
The following 3 files are in this category, out of 3 total.
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J.P. Menger en J.P.M. Menger - Groningen constant (1872) - kz.jpg 1,279 × 1,280; 260 KB
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J.P. Menger en J.P.M. Menger - Groningen constant (1872) - vz.jpg 1,279 × 1,280; 373 KB