Subject (Genre)
- Fiction99
- Encyclopedias90
- Exhibitions87
- Case studies72
- Apologetic writings68
- Commentaries64
- Terminology53
- Comparative studies49
- Pictorial works41
- Trivia and miscellanea39
- Bio-bibliography36
- Correspondence34
- Handbooks, manuals, etc30
- Genealogy28
- Indexes24
- Anecdotes23
- Essays23
- Maps23
- Military history23
- Conference proceedings22