Books etc in Digital (PDF) Format, by David Walker, on CD A Compendium Many of our digital products are now 'open access' and therefore available for free download, by arrangement with Oxygraphics. However, if you would prefer to have a CD mailed to your door, this compendium currently contains everything listed below and can be yours for £25 GBP, 35 EUR, $50 USD or the equivalent in other currencies. SEE Currency Exchange This includes first class mail in the UK and airmail elsewhere. To Order: Simply Email us your mailing address and we will mail you a CD. Simultaneously we will Email you an invoice. We accept payment by PayPal or by personal check or institutional order made payable in GBP. We would be obliged if you would return the invoice, with payment, only on safe receipt of the item that you order. This is what the Compendium CD contains at present (February 05) and we will add more as opportunity permits: 'Energy, Plants & Man' 'Like Clockwork'. A Leaf in Time in English, Spanish and bilingual English/Spanish. What better way for a nine year old to learn a little science and another language? 'The Use of the Oxygen Electrode and Fluorescence Probes in simple measurements of Photosynthesis' Global Climate Change PowerPoints in Photosynthesis and Related Topics Whatever happened to the beermats? No worry, as they say in Oz. They are still with us as a PowerPoint presentation. Alternatively, you can find the questions (without the illustrations) here and the answers elsewhere. .