Elvis Presley printed music

[hyperbolica]

I have a friend who has ~17 folios of sheet music for piano and voice of various Elvis tunes. These all have a photo portrait of Elvis on the cover, and are in great shape, without tears or dogears. They all appear to be from the 1960s. Titles like Viva Las Vegas (2 copies), It's a Wonderful World, Roustabout, Hard Knocks, It's Carnival Time, Big Love Big Heartache, There's a Brand New Day On The Horizon, Poison Ivy League, Carny Town, One Track Heart, Little Egypt, I Need Somebody To Lean On, If You Think I don't Need You, Today Tomorrow and Forever, Ain't That Lovin You Baby, C'mon Everybody.

There's a lot of other stuff, but this is what she thinks is valuable and would like to sell. There's a box full of other stuff from Gershwin to Madame Butterfly, and Favorites from the (18)90s.

Any idea where would be the best place to sell or appraise stuff like this?