A simple, free, comprehensive resource for finding the international standards for paper sizes in metric and imperial.
Paper Size Guide
A4 Format, A4 paper size & Uses, A-Series Paper
Printable Paper Size Chart (FREE!) - Leap of Faith Crafting
Sax School Smart - 85250 Newsprint Drawing Paper, 30 lb, 8-1/2 x 11 Inches, 500 Sheets, White : Arts, Crafts & Sewing
US Standard Paper Sizes for Printing & Framing - Shanty Town Design
Paper Size Guide - A0, A1, A2, A3, A4, A5, A6
Standard Paper Sizes for Printing [Infographic]
Paper size - Wikipedia
Printable Paper Size Chart (FREE!) - Leap of Faith Crafting