The night the stars went out
Hughes, Suz, author, illustrator.
North Mankato, MN : Picture Window Books, a Capstone imprint, [2016]

Oblivion
Armentrout, Jennifer L., author.
[United States] : Tantor Audio, 2016.

Oblivion : a Lux novel
Armentrout, Jennifer L.
Fort Collins, Colorado : Entangled Publishing, LLC., [2015]

Ohm vs. Amp
Ball, Nate, author.
New York, NY : Harper, an imprint of HarperCollinsPublishers, [2014]

Omega rising
Carman, Patrick, author.
New York : Random House, [2016]

Omega rising
Carman, Patrick, author.
New York : Random House Books for Young Readers, [2016]

On impact!
Ball, Nate, author.
[United States] : HarperFestival, 2014.

Once upon a space-time!
Brown, Jeffrey, 1975- author, artist.
New York : Crown Books for Young Readers, [2020]

Ooze slingers from outer space
Hoena, B. A.
Minneapolis : Stone Arch Books, [2007]

Ooze slingers from outer space
Hoena, B. A.
[United States] : Capstone, 2007.

Operation twin trouble
O'Ryan, Ray, author.
New York : Little Simon, 2015.

Out of this world
Wooding, Chris, 1977- author.
New York : Scholastic Press, 2020.

Party crashers
Roth, Jonathan, author, illustrator.
New York : Aladdin, 2018.

Phoenix
Said, S. F., author.
[United States] : Dreamscape Media, LLC, 2016.