He goes on to indicate that cork bodied decoys made c. 1930, when
Wild Fowl Decoys was published, were fabricated in two halves that were cemented and pegged together. At the time, available natural cork varied between 1 to 2 inches in thickness. Cork bodies could also be made from slabs made from ground cork or cork chips held together with an adhesive binder. These composite cork slabs were about 3 inches thick, and did not require a bottom board or keel since the material was stronger and denser than natural cork.