All seven books were published in hardcover editions by Andersen Press.
Dr. Xargle | Cover of ''Dr Xargle's Book of Earthlets'', first in the series (1988), art by Tony Ross |
He has also illustrated the Amber Brown series by Paula Danziger, the Dr. Xargle series by Jeanne Willis, and the Harry The Poisonous Centipede series by Lynne Reid Banks.