Does anyone know of a good treatment of Pauli's spin-1/2 theory?

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I'm currently in the midst of a QED course which presupposes a lot of relativistic QM, which I never saw in depth. I have found some good resources on the Dirac equation and its consequences, but most of them glance over the non-relativistic limit. While not crucial for what I need to know, I think that having a more thorough understanding of Pauli's theory of electron spin would help me become more familiar with the concept of spinors, which are objects that I do not yet truly "get" like I get other mathematical constructs in QM/QFT.

Thanks!

sam
 
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