Lot of 15 Louis L'Amour novels, including 2 from Sackett series:

Borden Chantry

Crossfire Trail

Chancy

Dark Canyon

The Iron Marshal

Milo Talon

Mojave Crossing

Mustang Man

The Rider of Lost Creek

Riding for the Brand

The Rustlers of West Fork

Showdown at Yellow Butte

Under the Sweetwater Rim

The Walking Drum

Where the Long Grass Blows