Chapter Opener Photo Credit

Chapter 1: M. Penn.

Chapter 2: Wikipedia: http://commons.wikimedia.org/wiki/File:Widnes_Smoke.jpg.

Chapter 3: Copyright © oversnap/iStockphoto.

Chapter 4: M. Penn.

Chapter 5: M. Penn.

Chapter 6: Federal Emergency Management Agency/M. Rieger.

Chapter 7: U.S. Army Corps of Engineers/Digital Visual Library.

Chapter 8: Copyright © Alan Crawford/iStockphoto.

Chapter 9: Courtesy of Ayres Associates.

Chapter 10: Copyright © OSTILL/iStockphoto.

Chapter 11: Courtesy of the Massachusetts Department of Transportation.

Chapter 12: P. Parker.

Chapter 13: M. Penn.

Chapter 14: Prill Mediendesign & Fotografie/iStockphoto.

Chapter 15: M. Penn.

Chapter 16: Prill Mediendesign & Fotografie/iStockphoto.

Chapter 17: Courtesy of S. Owusu-Ababio.

Chapter 18: Courtesy of R. Webster.

Chapter 19: Courtesy of Caltrans, District 4 Photography/J. Huseby.

Chapter 20: M. Penn.

Chapter 21: Andy McNeill.