I am trying to read through Volume 3 on Semiconductors, but many of the sections in chapter two are missing. electron holes? P-N structure? This is the best website I've found, and the information is gone! Can you fix it?

 

I can see these things: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-2/electrons-and-holes/
https://www.allaboutcircuits.com/textbook/semiconductors/chpt-2/the-p-n-junction/