David Helvarg

1951

• 50 Ways to Save the Ocean (Inner Ocean Action Guide) (Inner Ocean Action Guide)
• Blue Frontier
• Rescue Warriors
• Saved by the sea
• Saved by the sea
• The golden shore
• The Ocean and Coastal Conservation Guide 2005-2006
• The ocean and coastal conservation guide, 2005-2006
• The war against the greens
• 50 ways to save the ocean
• Rescue Warriors
• Saved by the sea