Gotta give respect to the people who collated and maintained this list, that can't have been easy. Is there a reason why some links like "Water" take me off to

Gotta give respect to the people who collated and maintained this list, that can't have been easy. Is there a reason why some links like "Water" take me off to another organisation's website or am I just missing things? (edit: I am guessing it's just an older site and no one is around to take care of it anymore?) This is a great resource and I hope I get a chance to spend more time reading through it.