This industry comprises establishments primarily engaged in the merchant wholesale distribution of bulk printing and/or writing paper generally on rolls for further processing. Illustrative Examples: Bulk envelope paper merchant wholesalers Bulk paper (e.g., fine, printing, writing) merchant wholesalers Bulk groundwood paper merchant wholesalers Cross-References. Establishments primarily engaged in the merchant wholesale distribution of stationery are classified in Industry 424120, Stationery and Office Supplies Merchant Wholesalers.