audiotapes

The Right Use of Power: How Stewardship Replaces Leadership, read by Peter Block. Sounds True, February 2002. CD or cassettes.
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Flawless Consulting: A Guide to Getting Your Expertise Used, Second Edition, read by Grover Gardner. Published by Penton Overseas, Inc and Audio Scholar Inc, 2001. CD or cassettes.
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Stewardship: Choosing Service Over Self-Interest, read by Michael Toms and featuring exclusive interviews with the author, Richard Teerlink, Margaret Wheatley and others. Two Audiocassettes. 
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The Empowered Manager: Positive Political Skills at Work.  San Francisco: Jossey Bass, 1987. Two Audiocassettes.
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for audiotapes of keynotes and workshops by Peter at conferences:

Innovation Groups, from sessions at Transforming Local Government Conference, 1999
 

videotapes

The Language of the Leadership Diamond, a videotape with Peter Koestenbaum. Two tapes and notebook. Peter Block Inc., 2000. 
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Stewardship: A Governance Strategy for the Learning Organization. 90 minutes. Pegasus Communications, 1995.

Improving Performance through Empowerment. 18 minutes. American Media, 1998.
Call 800-262-2557.