This was found in Lady Bird Johnson book a white house diary. Which I was told it was signed by her by my mom. This book has been with us for years but we are not the original owner. I decided to pull it out and noticed it had been signed twice once by ladybird and another by LBJ  which we had no clue it had both. Does this increase its value and am I  right about it being the former presidents signature ? Thanks for any help given !!!