Neither Squeak or Pharo have well maintained website and searching for documentation via google is very hit and miss. Pharo is worth downloading and playing with though. The old, main commercial implemention of Smalltalk is available through Cincom. VisualWorks was just about to take over the object world before Java was released:

https://www.cincomsmalltalk.com/main/

I have been blogging about it recently here:

https://smackeyacky.blogspot.com/