Spicy Clam Chowder - Contains ketchup, red pepper sauce, vegetables, and juice. - http://www.low-fat-recipes.com/soups/spicy-clam-chowder.htm
Clam Chowder - Made with flour, potatoes, onion, bell pepper, stock, and tomatoes. - http://www.recipesource.com/soups/soups/09/rec0951.html
Manhattan Island Clam Chowder - Made with fresh clams, pork, fresh tomatoes, wine, and crackers. - http://www.recipesource.com/soups/soups/09/rec0993.html
Manhattan Clam Chowder - Combines cherrystone with pork, potato, celery, and tomato juice. - http://www.recipesource.com/soups/soups/07/rec0793.html