Space: 1889 Must Have After the core rulebook, this volume contains the two key volumes of the now OOP series. Cloud Captains is the dramatic heart of Space: 1889 and Conklin's Atlas is second only to the core rules as the definitive sourcebook of the S: 1889 universe. If you are intending to play the game, buy this book.
Must have for Space: 1889 If you are planning to play Space: 1889, this is THE supplemental book to get. It gives much greater detail to Mercury & Venus than the rulebook, and adds to the information on Mars. The information on Victorian Earth is lacking, though the travel times and world maps of 1889 Earth are helpful. Cloud Captains provides interesting detail on Karkarham, "the Casablanca of Mars" - where just about anything goes. It is a great place to set a campaign for ribald adventurers.