Here are all the screens that Apple makes - The Verge
iPad Screen Size Guide & Web Design Tips - All The Specs You Need!
Size Comparison of a 12.9-Inch iPad with Smaller iPad Models and 13-Inch MacBook Air - MacRumors
iPad display list: Size, res, brightness for every model - 9to5Mac
How big is the iPad Pro display resolution? The iPhone 3G screen fits between the app icons - 9to5Mac
What is the Screen Resolution of 11 inch iPad Pro and 12.9-inch [2020]
Amazon.com : Apple iPad Mini 4 Wi-Fi, 7.9in Retina Display with 2048 x 1536 Resolution, A8 Chip, Touch ID, FaceTime, Up to 10 Hours of Battery Life - 128GB - Space Gray (Renewed) : Electronics