From the publisher:

Wild Silver Age comics classics follow squabbling Donald and Fethry Duck from hill country to the briny deep!

Who lives in a submarine under the sea? Donald's cuckoo-bananas cousin Fethry, that's who! He's roping desperate Don into a two-week treasure hunt on the ocean floor...and a bear-taming trip to Duckburg's deepest woods--and a mission to cure hiccups with scary rural remedies! Are fame and fortune worth it? Cartoon story man Dick Kinney and beloved kids'-comic artist Al Hubbard jammed on Disney duck tales in the swinging '60s--and by popular demand, Fantagraphics' Disney Masters series continues to collect their best! From Fethry's terrifying turn as Uncle Scrooge's efficiency expert in "It's Only Money" to Donald's romantic woes in "A Midsummer's Nightmare," the mayhem keeps on coming!

Fantagraphics' Disney Masters series unearths a treasure trove of previously unavailable comics epics in the grand Walt Disney tradition: expanding the lore of Mickey, Donald, and Scrooge, anthologizing the work of fan-favorite North American talents, and bringing you the best of the acclaimed international artists who have popularized Disney around the world. Rediscover Duckburg...and rewrite history!

Walt Disney's Donald Duck: 20,000 Leaks Under the Sea: Disney Masters Vol. 20 is part of the Disney Masters series.

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.