From the publisher:

In this collection of the classic comic strip, Mickey meets dinosaurs and more.

Decades before Jurassic Park, Doc Dustibones brings Mickey to Cave-Man Island--a lost world where fossil monsters survive alive! From stampeding brontosaurs to saber-tooth tigers, all of Goofy's least favorite Stone Age scares are here... and Dustibones is building a blimp to carry them to America! What could possibly go wrong? Floyd Gottfredson produced a canon of legendary, rip-roaring tales starring Mickey as a daring, two-fisted hero--in a world-famous series of legendary adventures! Lost in Lands of Long Ago also includes several other stories and more than 30 pages of prehistoric extras! You'll enjoy rare behind-the-scenes art, vintage publicity material, and fascinating commentary by a clan of Disney cave bears. Rediscover the wild, unforgettable personality behind the icon: Floyd Gottfredson's Mickey Mouse.

This came from the library of Burny Mattinson (1935-2023), an animator, director, producer, and story artist for Walt Disney Animation Studios, from 1953 until his death in 2023. Mattinson directed Mickey's Christmas Carol and The Great Mouse Detective. He was named a Disney Legend in 2008 and was the longest serving employee of The Walt Disney Company, with a career that spanned almost 70 years. His extensive library included numerous subjects and especially large collections of books on Disney, animation, and classic comic strips.