Paper manufacture required only rags and running water

Evidence

The manufacture of paper was far cheaper and more efficient than the production of parchment from animal skins: all that paper-mills required were a steady supply of linen, cotton or hemp rags and a source of running water to power the hammers that reduced the rags to pulp. — Andrew Pettegree, Arthur der Weduwen, The Library- A Fragile History, 163

Categorization

• corroborated: 2 independent passages support this claim — Andrew Pettegree, Arthur der Weduwen, The Library- A Fragile History, 163