Horizon Information Portal

	Series	Count
1.	Discovery travel adventures	1
2.	Discreet Retrieval Agency mysteries	0
3.	See Chance, Maia. Discreet Retrieval Agency mysteries	2
4.	Discussion paper (Hawaii. Commission on Manpower and Full Employment)	1
5.	Discworld novel	0
6.	See Pratchett, Terry. Discworld series	10
7.	Discworld series	0
8.	See Pratchett, Terry. Discworld series. Spoken word	4
9.	See Pratchett, Terry. Discworld series	10
10.	Discworld series (New York, N.Y.)	0
11.	See Pratchett, Terry. Discworld series (New York, N.Y.)	51
12.	Disease update	6
13.	Diseases and disorders	0
14.	See Diseases and disorders series	55
15.	Diseases and disorders (ReferencePoint Press)	0
16.	See Compact research. Diseases and disorders	9
17.	Diseases and disorders series	55