The Aqualung Twins and the Iron Crab

First edition, first printing. 188pp, with illustrated frontispiece and several further illustrations in text. 12mo. In blue cloth boards with gilt titles on spine. Cloth a little worn and mildly marked, cloth rounded at spine base. Some mild spotting on text block edges and pages, else neat and clean. In its original worn and rubbed dust jacket, with some small closed tears at edges and minor loss at spine tips. Another exciting adventure for the unusual twins, Pamela and Grant, who have aqualungs. In this adventure they meet an eccentric professor on a secret island.