Sarah Nephew wrote several books published by That Patchwork Place, now Martingale, that used 60 degree diamonds and triangles to construct this quilt and baby blocks, eliminating the Y seam. These were constructed vertically. I believe the books are out of print but I'm sure Amazon or Ebay would be places to look. Sarah also created the Clearview Triangle. I have some of her books but it would take me a long time to find them since the quilt book library is expansive and stored in several places.