View source for Jo Cals

===Trivia===
Between 1968 and 1970, Cals was in charge of the Dutch entry to the [[Expo '70]] in Japan. From 1967 he was chairman of the National Advisory Committee on the amendment of the Constitution.

Cals was a hard worker but this was at the expense of his health, he died from a [[brain tumor]] in the [[MCH Westeinde hospital]] in [[The Hague]] on 30 December 1971 at the age of 57.<ref>{{cite web|url=https://www.nrc.nl/nieuws/1991/10/12/noud-cals-over-zijn-vader-mr-jo-cals-en-het-einde-6983490-a1204670#:~:text=Niet%20lang%20daarna%20wordt%20Cals,in%20Den%20Haag%20gekluisterd%20liggen.|title=Noud Cals over zijn vader Jo Cals en het einde|publisher=NRC Handelsblad|date=1991-10-12|accessdate=2026-03-13|language=nl}}</ref><ref>{{cite web|url=https://www.nd.nl/cultuur/cultuur/707719/de-late-doorbraak-van-jo-cals|title=De late Doorbraak van Jo Cals|publisher=Nederlands Dagblad|date=2004-12-31|accessdate=2026-03-13|language=nl}}</ref>