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The letter buttons below show series with 5 or more titles. Series with fewer titles can be found using the search form above.

28 series starting with X

• X 8
• X (anthologies) 5
• X (Japanese magazine) 11
• X-100 SF 6
• X-Clan 5
• X-Editorial (FSFnet) 5
• The X-Files 11
• The X-Files (nonfiction) 5
• The X-Files Universe 50
• The X-Files Young Adult Series 17
• The X-Files Young Readers Series 12
• X-Men 18
• X-Ops 9
• X-Universe 7
• Xandia 5
• Xanth 60
• Xavier Naidoo Monday Sing-a-long 5
• Xeelee 82
• Xena: Warrior Princess 26
• Xeno Relations 7
• Xenogenesis / Lilith's Brood 7
• Xenophilia 6
• Xenos 6
• XGeneration 8
• Xian Warriors 5
• Xizquil 8
• Xoe Meyers 9
• Xtreme Science 10