pb?Paperback. Typically 7" by 4.25" (18 cm by 11 cm) or smaller, though trimming errors can cause them to sometimes be slightly (less than 1/4 extra inch) taller or wider/deeper.
Notes: Cover artist credited on the copyright page.
"Del Rey mass market edition: April 2019"
Data from Amazon and Locus Magazine #700 as of 2019-05-04.