RiverCas, Blue Rhine, Midi, Lined. Blue Rhine cover, with its rippling embellishment suggestive of water in motion, comes from a 1729 book originally published in Basel, Switzerland, along the banks of the River Rhine. 100% recycled binder boards. Decorative printed cover paper FSC-certified text paper. Threaded stitching and glue, as needed. Acid-free sustainable forest paper.