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Poseidon Rulebooks

GURPS Blue Planet

2002 Sourcebook GURPS (3rd Edition) GURPS Blue Planet (1) Modern (Near Future) Science Fiction

Ancient Echoes

1999 Sourcebook Blue Planet (2nd Edition) Science Fiction (Hard Sci Fi)

Archipelago: A Guide to the Islands of Blue Planet

1997 Campaign Setting Sourcebook Blue Planet (1st Edition) Science Fiction Science Fiction (Hard Sci Fi)

Bloodsport

2014 Adventure Blue Planet (Revised) Science Fiction (Hard Sci Fi)

Blue Planet Game Master's Guide (Revised Edition)

2012 Campaign Setting Core Rules Blue Planet (Revised) Science Fiction (Hard Sci Fi)

Blue Planet Moderator's Guide

1999 Core Rules Blue Planet (2nd Edition) Science Fiction (Hard Sci Fi)

Blue Planet Player's Guide

1999 Core Rules Blue Planet (2nd Edition) Science Fiction (Hard Sci Fi)

Dolphins, Guns, and Money

2014 Adventure Blue Planet (Revised) Science Fiction (Hard Sci Fi)

Expanded Skill Use for Blue Planet

2015 Sourcebook Blue Planet (Revised) Science Fiction (Hard Sci Fi)

First Colony

2000 Sourcebook Blue Planet (2nd Edition) Science Fiction (Hard Sci Fi)