DK Childrens Encyclopedia - Hardcover By DK - ACCEPTABLE

First Science Encyclopedia - Hardcover By DK - GOOD

First Science Encyclopedia - Hardcover By DK - ACCEPTABLE

DK Nature Encyclopedia - Hardcover By DK Publishing - ACCEPTABLE

DK Science Encyclopedia (Revised Edition) - Hardcover By Susan McKeever - GOOD

Dk Visual Encyclopedia Of Science - Hardcover By Dorling Kindersley - VERY GOOD

First Science Encyclopedia (DK First Reference) - hardcover DK

Dk Visual Encyclopedia Of Science - Hardcover By Dorling Kindersley - GOOD