A series is a related set of things that occur one after the other (in a succession) or are otherwise connected one after the other (in a sequence). The specific meaning depends on the context.
In science:

Blackwater Station - Information on amateur, gamekits, and commercially available games. Features reviews, news, beginner's guide, and overview of existing games.
Meta Description: [ All you need to know about 18xx railway games ]
1870 Play-by-eMail - Site for pbem games of 1870 (Mississippi Valley). Includes FAQ, rules clarification, reviews and strategy guidelines. Maintained by Nick Markevich.
Meta Description: [ Anytime, anywhere, EarthLink connects people to the power and possibilities of the Internet. Connect to the Internet with High Speed, DSL, Cable, Satellite, Voice, trueVoice, Samsung Wireless, Dial-up. ]
18xx Rules Difference List - Includes an analytical list of rule differences among 18xx games. It covers most games and is maintained by Nick Wedd.
Crisis - By Robert Jasiek. An urban game design. Features general and historical information.
Information about 18xx + 18xx/PC Moderator - This german site is the homepage of the 18xx moderator program. It contains information about 18xx variants and other free software.
Lonny's 18xx - Leonhard Orgler's 18xx designs: 1837 (Austria) and 1854 (Austria).
Meta Description: [ profi Webspace und Mineralien Infos ]
Mark Derrick - Includes information concerning Mark Derrick's 18xx designs: 18TN (Tennessee, also known as 1851), 18GA (Georgia) and 18AL (Alabama).
Minstrel HT - 18xx games - supplement to the paper based Minstrel and links into the UK postal gaming hobby
Meta Description: [ Minstrel, dedicated to the playing of 18xx games by post with added web publication. ]
Mostly 1835 - Contains information on 1835 (Germany), including a FAQ and rules for variants. Maintained by Bill Stoll. The page also hosts 1835 pbem games.
Ps18xx - Contains downloadable PostScript files of maps and tiles for most 18xx games. Postcard ware by Matthias Klose.
Rails18xx - Marco Rocci's Rails18xx software suite. Includes information and downloads for TileDesigner, GameSetDesigner and GameModerator applications.
Meta Description: [ Something about train boardgames and the 18xx system in particular, including the Rails18xx moderator project ]
Westpark Gamers - Links and information about the series.
Meta Description: [ Westpark Gamers Homepage mit Informationen, Links, Spielberichten und Rezensionen über Brettspiele und Kartenspiele. ]
Yahoo! Groups: 18xx - Discussion group for 18xx fans. Requires joining to post.
Meta Description: [ 18xx: Railway Board Games based on 1829, 1830 ]
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