Johannes Diderik van der Waals
The Dutch government started a new kind of secondary school (HBS, a school aiming at the children of the higher middle classes)
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Johannes Diderik van der Waals
The Dutch government started a new kind of secondary school (HBS, a school aiming at the children of the higher middle classes)
Text from Wikipedia, available under CC BY-SA 4.0.
Captured 2026-08-17 from Wikipedia. The archived copy is preserved so this citation survives link rot.