A method of categorizing different types of paper by size, weight, pulp composition, manufacturing procedure, thickness, and end use. There are hundreds of different paper grades and sub-grades. See Bond Paper, Bristol Paper, Coated Paper, Cover Paper, Duplicator Paper, Imitation Parchment, Index Paper, Ledger Paper, Manifold Paper, Mimeograph Paper, Newsprint, Offset Paper, Onionskin, Safety Paper, Tag Paper, Text Paper, and Wedding Paper.