I have a cookbook from 1968 where several of the recipes call for "1 can frozen shrimp soup". I've never heard of that. I tried looking it up on line and only find Campbells Condensed Cream of Shrimp Soup or recipes for soup using frozen shrimp. Has anyone ever heard of this? Is it still in production, and if not what can I use as a substitute? The recipe doesn't say if it's condensed soup or not. Can anyone help? Thanks so much!!