11X17″ / Quadrille Grid Blueprint and Graph Paper (5 Pads, 50 11X17″ (5 Pads) | eBay
11 X 17 Clear Plastic Document Holder, Wall Mount - GS Direct, Inc.
Emergency Evacuation Map Holder
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Amazon.com : 11x17 Inch Ledger Hardboard/Clipboard with 3 Lever Operated Clips and a Mini-Calculator, Either Landscape or Portrait Media Format, ECO-Friendly and Great Drafting Drawing Board Brown (1 Pack) : Office Products