Acknowledgements

We are grateful for Natural Resources Canada, Service New Brunswick, and District 18 School Board of New Brunswick for providing us with the data. The following have contributed towards the production of the first edition of the text and animated demonstrations: Jennifer Chan, Albert Chow, Jamie Parsons, Kasia Pochec, Wendy Wells, and Marta Wojnarowska. Lori Mofford and David Fraser have helped to upgrade the original text to the current edition.