The most readily available version is his 'History of Australian Bushranging Volumes 1 & 2' (Australian Classics edit).

Of interest to me is volume 2 which includes the Kelly story.

Here I reproduce the chapters pertaining to the killing of Aaron Sherritt and the siege at Glenrowan. 

The Murder of Aaron Sherritt

The Last Exploit of the Outlaws. 

How the Special Train was saved.

The Conflict at the Hotel and the Capture of Ned Kelly.

Proceedings within the Hotel

How Hart and Dan Kelly fell.