Here is another recipe that I've been making for years.  It's also out of the original crock pot book.

     MANHATTAN CLAM CHOWDER

     1/4   pound salt pork or bacon, diced and fried

     1            large onion, chopped

     2            carrots, thinly sliced

     3            stalks celery, sliced

     1            tablespoon parsley flakes

     1           28 oz. can tomatoes

     1-1/2 tsp. salt

     2    or 3 cans clams (7 to 8 oz.) with liquid

     2       whole peppercorns

     1     bay leaf

     1     tsp. dried thyme, crushed

     3       medium potatoes, pared and diced

Put all ingredients in CROCK-POT.  Cover and cook on Low 8 to 10 hours.