TITLE: Reference: Finite $p$-Groups
QUESTION [7 upvotes]: Hall and Blackburn made important contributions in the study of regular $p$-groups and $p$-groups of maximal class. From their work, one can understand that in the classification of groups of order $p^n$, we must have to make two main cases: $p\leq n$, and $p>n$. 
With this interest, I am searching more and more material to study small $p$-groups, and their classification. The books I referred are that of Berkovich (Groups of prime power order) and of Leedham-Green, McKay (Structure of groups of prime power order). 
Beside these two main references, can one suggest other books/notes which contains study of $p$-groups of maximal class and regular $p$-groups?
(The book of Berkovich mentions one book in bibliography, that of A. Mann-Finite $p$-groups; but I couldn't find this book. Is this book or notes published?)

REPLY [13 votes]: It's true that at one time I thought of writing such a book, and even wrote a few chapters, but at the moment I'm not sure if I'll ever finish it, so I'm telling people asking about it not to hold their breath.
It should be noted that the book Structure of Groups... mentioned in the question has two authors: Charles R. Leedham-Green and Sue McKay.
Avinoam Mann