Jeanharville asked upthread how blocks are identified. My method is pretty straightforward. I have several block reference books with thousands of block images in them, all searchable by name and/or construction type, plus vast resources available on the internet.
The thing with block identification is that if there are any differences at all, it's not the same block. You can't say "it's the same as Winding Ways...except for the proportion of the pieces and the difference in the seams" or "it's the same as Crossed Canoes...except it doesn't have the four triangles in the center." The fact that it isn't the same means just that...it isn't the same. Close only counts in horse shoes, as they say.
The pattern for The Great Circle Quilt is included in Aunt Martha's Favorite Quilts along with 16 other classic vintage quilt patterns for the ridiculously low price of $4.50. It's a 15 page pamphlet of pattern pieces, not really a book, but there are some great quilt patterns in it.
http://www.colonialpatterns.com/prod...roducts_id=938