This book used to be available on: http://www.religiousworlds.com/mandalam/index.html, UK site: http://www.hubcom.com/tantric, and the North American Mirror Site http://www.clas.ufl.edu/users/gthursby/tantra/ but those sites are no longer available.
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I’ll just note that Varahi is not male, Varahi is a mother goddess, not Varaha considered avatar of Vishnu.