Development:Pokémon Red and Blue/Sprites - The Cutting Room Floor

Pokémon Red and Green beta - Bulbapedia, the community-driven Pokémon encyclopedia

Pokémon Red and Blue - The Cutting Room Floor

Pokémon - Context Switch (redux)

7 Grand Dad, BootlegGames Wiki

Showcase] - Pokémon North, South, East, and West: The Largest Sprite Dex ever!, Page 2

What Dreams May Come: Prototype Data for Pokémon Red and Green – Helix Chamber

Pokémon Gold Beta Demo Has Been Leaked After 21 Years - oprainfall

If There Was A New Game For Switch, Which Sprites Would It Use? : r/marioandluigi

What Dreams May Come: Prototype Data for Pokémon Red and Green – Helix Chamber

Blog Posts - Plague von Karma's Pokemon Prototype Research Blog

Pokemon Gen 1 Cut Content - People, Places, & Pokemon - Dr Lava #13

SQUARE ENIX The Official SQUARE ENIX Website - Tagged

Sprites & Tiles

Apparent Pokémon leak turns 'Beta Wooper' into a sensation - Polygon

GitHub - PlagueVonKarma/kep-hack: A ROM Hack based on the Kanto Expansion Pak Showdown Mod, started by @MementoMartha. Uses @pret's pokered disassembly.