You can obtain papers through several specific in-game milestones:

: You can carry over up to 20 Pedigree Papers into a New Game+, giving you a significant head start in subsequent playthroughs. Why Pedigree Papers Matter

In Kairosoft's , "Pedigree Papers" (or simply "Papers") are essential items used to unlock new horse breeds and improve your racing stock through breeding. These papers act as research blueprints that allow you to introduce higher-quality pedigrees to your ranch. How to Acquire Pedigree Papers