I recommend two books:
The Hanlon Brothers - Their Amazing Acrobatics, Pantomimes and Stage Spectacles by John A. McKinven (1998 David Meyer Magic Books)
Leap for Life by Martha Blair Sheppard (1999 The Cohasset Historical Society)

There is also a PhD dissertation (which I haven't yet seen):
From daredevil acrobatics to 'Le Voyage en Suisse': The Hanlon Brothers, 1833--1884 (England)
Cosdon, Mark Norman
Academic institution: TUFTS UNIVERSITY. Year: 2001. Pages: 279. Advisor: Senelick, Laurence.

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