These slides appear to be from the 1959 Centennial Cavalcade tour, based on the date listed on the eBay description.
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“For sale is a Lot of Nine (9) Vintage Color Photo Slides of 1959 Outdoors Jeep Train Tour Vacation.
Pre-owned condition. I didn’t do any color corrections or touch ups in the preview pictures. May show some slight wear from age. No serious damage.
Please see photos for more details. Photos are part of the description. I make all effort to list any defects or damage in my listings.”