Contributors

• Bruce D. Ryan, Tempe, Arizona, U. S. A.
• Frank Bungartz, Porto Ayora, Galápagos, Ecuador
• Peter Döbbeler, München, Germany
• Gregor Hagedorn, Berlin, Germany
• Maria Herrera de los Angeles Campos, Mexico City, México
• Kerry Knudsen, California, U. S. A.
• Tom Nash, Tempe, Arizona, U. S. A.
• Gerhard Rambold, Bayreuth, Germany

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