Hi Everyone,
I've been a long time collector of celebrity autographs but never have wanted to sell any. I recently discovered that my family is in possession of an autograph from an astronaut who died in one of the spaceshuttle explosions. My family wants to sell this. Would you mind recommending any steps I should take to go about selling this autograph? I live in Southern California and I would love to get it appraised and find a dealer.

Thank you,
Chris