The two listings for Green and Pleasant Land are the same book, published jointly by Chaosium and Games Workshop with two different ISBNs and stock numbers.

US Edition (Chaosium): Stock #2320
UK Edition (Games Workshop): Stock #004450

Companion for Call of Cthulhu 3rd Edition.

Featured within are sections on British Characters, History, Travel, the Occult, and much more besides, which provide all the information Keepers require for British Cthulhu roleplay.

Also included - three new adventures!

The Horror of the Glen
Death In The Post
The Shadow over Darkbank

Story: The Running Man By Brian Lumley