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?)

Enumeration of Finite Groupsby Blackburn, Neumann, and Venkataraman has a lot of information on $p$-groups. – Richard Stanley Dec 21 '12 at 17:45