Swamp White Oak, Native Trees, Johnson's Nursery
Trainer Profile: Gary Oak by WillDinoMaster55 on DeviantArt
Blue Oak, Heroes Wiki
Blue Oak, Heroes Wiki
Pokémon Trainer Battle: Professor Oak VS Blue (BEST TEAMS COLLIDE! True Power Tournament Semifinals)
Trainer Spotlight: Professor Oak
Why I Like Rival: Blue/Green+Character Analysis
Trainer Profile: Green (or Blue) Oak Pokemon rayquaza, Pokemon teams, Pokemon
Trainer Green/Blue Oak: Review, Thoughts and First Impressions
Absolution Water - Thousand Oaks, California, United States, Professional Profile
Pokemon: Let's Go: How to Find and Fight Red, Blue, and Green
Daisy Oak - Bulbapedia, the community-driven Pokémon encyclopedia
Blue
Trainer Green/Blue Oak: Review, Thoughts and First Impressions
Here is a map I made with the location and info for all catchable Pokemon in Red, Blue and Yellow in celebration of the 20th anniversary. : r/pokemon