From A copy of Poo Poo And The Dragons, written by C.S. Forestor and illustrated by Robert Lawson, sold on eBay for $752 on May 22, 2006 (eBay Item#7030268919):
From the item description:
"This is a first edition, signed and inscribed by author C. S. Forester, illustrated by Robert Lawson. "Raisa Rogozina, best wishes from C. S. Forester, 22nd August 1942."
A lovely book about Poo-Poo (Harold Heaveyside Brown) and Horatio, a very playful dragon. I’m not an expert but the book is in fine condition with a little ripple at the bottom right corner, otherwise boards have no discoloration or wearing. […] Jacket is in fine condition with just a few chips at the corners and bottom of spine and slight discoloration on back edges. Also included is a memo from the publishers dated August 12, 1942."
The Children’s Picturebook Price Guide listed the book for $780 in VG+ condition, which is probably a bit low, since eBay auctions tend to be closer to wholesale then retail. Market price should be in the $1200 range.