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Use the NLM Classification to determine the appropriate class number for the following sets of subject headings and publication types:

1. 650 12 Fluoxetine $x therapeutic use
   650 22 Depression $x drug therapy
   655 _2 Statistics

QV 77.5-Incorrect.
QV 16-Correct.
QV 126-Incorrect.

2. 650 12 $a Quality of Health Care
   655 _2 $a Handbooks

W 84.4-Incorrect.
W 39-Incorrect.
W 49-Correct.

3. 650 12 Geriatrics
   651 _2 United States
   655 _2 Directory

WT 22 AA1-Correct.
WT 100-Incorrect.

4. 650 12 Orthodontics
   655 _2 Atlases

WU 17-Incorrect.
WU 417-Correct.
WU 400-Incorrect.

5. 650 12 $a Neoplasms $x epidemiology
   655 _2 $a Statistics

QZ 16-Incorrect.
QZ 220.1-Correct.