Horizon Information Portal

	Series	Count
1.	Opposing viewpoints in world history series	2
2.	Opposing viewpoints series (Subtitle)	0
3.	See Current controversies	101
4.	See At issue (San Diego, Calif.)	33
5.	Opposing viewpoints series (Unnumbered)	300
6.	See Also American history series (San Diego, Calif.)	15
7.	Opposites	0
8.	See Doudna, Kelly, 1963- Opposites	6
9.	Opposites (Minneapolis, Minn.)	0
10.	See Donner, Erica. Opposites	6
11.	Oppositions books	1
12.	Oprah Winfrey Network documentary club	0
13.	See OWN documentary club	1
14.	Oprah's book club	15
15.	[Oprah's book club]	6
16.	Oprah's book club (Random House Large Print)	1