Nice companion is AllAboutCircuits online textbooks:
https://www.allaboutcircuits.com/textbook/digital/
Archive has the original Bell Labs manual from 1951, with some really beautiful logic gate diagrams
The Design Of Switching Circuits by William Keister, Alistair E Ritchie, Seth H. Washburn
https://archive.org/details/TheDesignOfSwitchingCircuits