Light Beings: Master Essences
by Petra Schneider, Gerhard Pieroth
ISBN 13: 9780910261180
Format: Paperback (272 pages) Publisher: Lotus Press Published: 30 Sep 1998
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Quality Assurance for Chemistry and Environmental Science: Metrology from pH Measurement to Nuclear Waste Disposal
by Günther Meinrath,Petra Schneider
ISBN 13: 9783540712718
Format: Hardcover (326 pages) Publisher: Springer Published: 27 Sep 2007