A Tale of a Tub
Robert Hendrickson notes in his book "British Literary Anecdotes" that "Swift was always partial to his strikingly original "The Tale of a Tub" (1704). On reading the work again in later years, he exclaimed 'Good God! What a genius I had when I wrote that book!'"
A Swiftly Tilting Planet
This is the third book of the Time Quintet, preceded by, in publication order, "A Wrinkle in Time" (1962) and "A Wind in the Door" (1973). However, this was not the chronological order. Though "Many Waters" was written and published later than "A Swiftly Tilting Planet", it takes place earlier with respect to the characters. The last book in the Quintet, "An Acceptable Time" takes place a generation after "A Swiftly Tilting Planet", and is part of the Polly O'Keefe series of books. The larger "Murry-O'Keefe" series (the Time Quintet plus the books of Poly/Polly O'Keefe) contains three novels between "A Swiftly Tilting Planet" and "An Acceptable Time" in terms of character chronology. These are "The Arm of the Starfish", "Dragons in the Waters", and "A House Like a Lotus."