It’s a good book for its time but I’d argue very much outdated nowadays. With the advent of YouTube, even the book as a medium isn’t really ideal for learning how the lifts should look and identifying errors. And that’s without mentioning some of the more dogmatic content.
Someone agrees with me!
The book Starting Strength is a must if you are lifting. From memory, there are around 80 pages on squatting - everything is covered.