Foreword To the Circular SWCircle Id: 1 State: 1 Alias: Created: Friday, 21 January 2022 21:36 Ref: 1- 1- 1 Volume: 1 Issue: 1 Page: 1 PageInt: 1 Illustrated: FALSE Letter: FALSE Photo: FALSE Review: FALSE Author: Tustin, R.E. ParentItemId: