Mistakes and changes

Care goes into this material, and even so it carries no promise of being complete, current, or error-free. A subject can change after a page about it is written.

Sites linked from here

Pages elsewhere are revised on their owners' schedules, not this one's. What a link pointed to when it was added may not be what it points to today.

Getting in touch

Queries about the accuracy of something published here can be sent to [email protected].