Losie's right, Pat. Pick the fabric you think you'd most enjoy collecting and working with for a long, long time. Civil War repos are reproductions of fabric produced just before and during the Civil War (the early 1860's) and 1930s repos are reproductions of fabric made during the 1930's. A good example of that is on Aneal's "that quilt" site or her store site, which is twiddletails.com. The Aunt Grace fabric line is another example of 20's or 30's repos. If you google "civil war fabric", you'll get tons of examples of that.