TITLE: About unpublished lecture notes of Philip Hall
QUESTION [25 upvotes]: When I study group theory, I find that there are some mysterious things. For example, Daniel Gorenstein, in his paper On a Theorem of Philip Hall,  mentioned the unpublished lecture notes of Philip Hall. Many other famous group theorists also confirmed that these notes are important to their work. Since the notes are not published, I can not find way to see them. But I am very curious about what's in these notes. In these notes, are there any theorems about groups that are not otherwise known or do not appear in published books or papers?

REPLY [18 votes]: Apparently the original notes have been published online by Washington University here 
I must add that I'm an admirer of Hall's math, and its an emotion to read his handwritten notes.