Grandpa drawings

I ate lunch with my Grandpa today and he had been telling me he had some old drawings my dad did when he was a kid. He said he couldn't find them, but he found some that he had drawn when he was around fifteen years old. They're really cool! He's 81 now, so they're from the early 40's. I knew my dad could draw, but I didn't realize my Grandpa could too.