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Daniel Hopkinson, who photographed the Materials Board on pages 20-21 of this month's Specifier's Choice, is an architectural photographer based in Manchester

Catherine Harrington, who looks at ecologically sound roofing as part of the roofing theme on pages 41-54, is an associate with sustainable design practice Architype

Eelco Hooftman, who writes about designing for the public realm in the landscape and exterior products theme on pages 29-37, is a director of landscape architect Gross Max

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