From the publisher:

Produced with full access to Caniff's extensive personal archives at The Ohio State University, and with the cooperation of the Caniff estate, this oversized book reproduces from the original artwork hundreds of comics, illustrations, pencil sketches, and drawings--including many not previously reprinted. In addition to the three famous comic strips, represented are his childhood drawings, the beginnings of his career as a newspaper cartoonist, his significant contributions to the 1940s war effort, as well as his continuing relationship with the Air Force, Boy Scouts, and other organizations.

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.