Letter paper dimensions.This size is used in the USA and Canada.
Planner Sizes: The Ultimate Guide - Get Organized HQ
Standards of paper dimensions in different countries: : r/MapPorn
A Paper Sizes - A0, A1, A2, A3, A4, A5, A6, A7, A8, A9, A10
A4 vs Letter: What Is the Difference?
Paper size - Wikipedia
Paper Sizes and Formats, the Difference Between A4 and Letter
US Half Letter Paper Dimensions & Drawings
A4 Paper Size - Canva Design Wiki size guide - Canva's Design Wiki
How To Choose the Right Paper Size - The Paper Mill Blog
Letter Paper Dimensions
Two ways to switch between Letter and A4 paper sizes in Microsoft Word - Office Watch
Letter Sizes - Canva's Design Wiki size guide - Canva's Design Wiki