Binding: A new standard soft binding possibility, especially with small quantities is the Fastback cloth tape method which is a bridge between tape and staple and perfect binding:  The block of the book is glued like it would be for a perfect binding with front and back covers attached.  Then to cover the glued edges and for further reinforcement a strip of cloth binding tape is used for the spine. 

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This section is drawn from information online at http://www.gregathcompany.com/sb/index.html