Series starting with H
- Hardy Boys / Nancy Drew Crossover
- Hardy Boys/Nancy Drew Super Mysteries
- Hardy Boys Special Collections
- Hardy Boys: The New Case Files
- Hardy Boys: Undercover Brothers
- Hare and Badger
- Harem
- Harem Slave
- Hark! A Vagrant
- Harker Academy
- Harleian Society Publications
- Harlem Beat
- Harlequin
- Harlequin Blaze
- Harlequin Blaze (Leslie Kelly)
- Harlequin Collection Azur
- Harlequin Desire
- Harlequin Especial Bodas
- Harlequin Historical
- Harlequin Intrigue Box Set
- Harlequin Medical Romance
- Harlequin NASCAR
- Harlequin Omnibus
- Harlequin Presents . . .
- Harlequin Presents Extra
- Harlequin Romance
- Harlequin's Collection
- Harlequin Superromance
- Harlequin Temptation
- Harley Quin
- Harley Quinn
- Harley Quinn (2016)
- Harley Quinn (2021)
- Harlot's Bay
- Harlow Close
- Harmony Harbor
- Harmony Harbor (Mason, Debbie (Novelist))
- Harmony, Indiana
- Harmony Pointe
- Harold
- Harold & Chester
- Harold Shea
- Harper
- Harper and Lane
- Harper Boys
- HarperBusiness Essentials
- Harper Connelly
- Harper Falls
- Harper Hall of Pern
- Harper McDaniel
- Harper Perennial Olive Editions
- Harper's
- Harper Via
- Harriet Beamer
- Harriet the Spy
- Harrigan Family
- Harris and Bostock
- Harris Brothers
- Harris Brothers World
- Harrison Investigation
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