Interface Builder™ and Object-Oriented Design in the NeXTstep® Environment by Michael K. Mahoney
This was available for on the Peanuts-1 CD but the following link converts the .ps to .pdf
https://discmaster.textfiles.com/view/29330/Peanuts-1.iso/Documents/developer/objc/IB_tutorial.ps.gz/IB_tutorial.ps (https://discmaster.textfiles.com/view/29330/Peanuts-1.iso/Documents/developer/objc/IB_tutorial.ps.gz/IB_tutorial.ps)
It seems to be for NS2.0 but should be easy to change for NS3.3/OS4.2. He also co-wrote the free NextStep programming pdf on the Simson site.
Not the most useful thread title, but definitely a valuable find.
Can you add Interface Builder™ and Object-Oriented Design in the NeXTStep® 2.0 Environment to the title. I don't know why I forgot that.