Doubles, Dummies and Dolls: 21 Terror Tales of Replication

Doubleshot

Deadly Doubles (The Nancy Drew Files Case, No 7)

Sailing to Byzantium/Seven American Nights (Tor Doubles, No 10)

Twins and Doubles

Ill Met in Lankhmar/the Fair in Emain Macha (Tor Science Fiction Doubles, No 19)

The New Doublespeak: Why No One Knows What Anyone's Saying Anymore

No Truce With Kings/Ship of Shadows (Tor Doubles, No 5)

Doubleshot

Doubles or Nothing (FullHouseStephanie)