thin+skin+or+coating
131Papermaking — [ thumb|230px|right|The Diamond Sutra of the Chinese Tang Dynasty, the oldest dated printed book in the world, found at Dunhuang, from 868 AD.] Papermaking is the process of making paper, a material which is used ubiquitously today for writing… …
132Polyethylene glycol — IUPAC name poly(oxyethylene) {structure based}, poly(ethylene oxide) {source based} …
