A Swiftly Tilting Planet

From Author Wars - https://authorwars.com/publications/a-swiftly-tilting-planet-285779.html

Overview:

Title: A Swiftly Tilting Planet
Author: Madeleine L'Engle
Year: 1983
ISBN-10: 0374373620
Publisher: Farrar, Straus and Giroux
Pages: 278
Binding: Trade Paperback
Type: Novel
Title Reference: A Swiftly Tilting Planet
Notes:
- price unknown; none on book; it's possible it was BCE or SFBC
- undated except for 1978 copyright, but from a set of 1983 printings including a dated 42nd A Wrinkle in Time and 11th A Wind in the Door
- cover artist not credited, but "L + D Dillon" signature visible in lower right corner of front cover