Surprisingly colorful account of ED50's origins: https://www.gim-international.com/content/article/european-datum-1950-a-history https://www.gim-international.

Surprisingly colorful account of ED50's origins: https://www.gim-international.com/content/article/european-datum-1950-a-history https://www.gim-international.com/content/article/european-d... Toward the end is info on ED50's relationship to WGS-84.