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- Siegel, Mark, 5 worlds, 1
- Siegel, Mark, 5 worlds, 5
- 5 worlds, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller, Book 1
- Siegel, Mark, 5 worlds, book 2
- 5 worlds, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun, Book 4
- Siegel, Mark, 5 worlds, book 3
- Siegel, Mark, 5 worlds, book 4
- 5 worlds, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller, Book 3
- Sailor Twain, or, the mermaid in the Hudson, Mark Siegel
- 5 worlds, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun, Book 5
- 5 worlds, Mark Siegel, Alexis Siegel ; [illustrated by] Xanthe Boume, Boya Sun, Matt Rockefeller, Book 2
- 5 worlds, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller, Book 1
- Secret coders, Gene Luen Yang & Mark Siegel, 2
- 5 worlds, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun, Book 4
- 5 worlds, Mark Siegel, Alexis Siegel, Xanthe Bouma, Boya Sun, Matt Rockefeller, Book 3
- 5 worlds, Mark Siegel, Alexis Siegel ; Xanthe Bouma, Matt Rockefeller, Boya Sun, Book 5
- 5 worlds, Mark Siegel, Alexis Siegel ; [illustrated by] Xanthe Boume, Boya Sun, Matt Rockefeller, Book 2