Genre
Electronic books
616
Sources
360
Treaties
270
Periodicals
193
Cases
175
Statistics
90
Genealogy
70
Indexes
56
Bibliography
50
Handbooks, manuals, etc
40
Registers
39
Census, 15th, 1930
38
Census, 1930
38
Traités
36
Records and correspondence
34
Archives
28
Congresses
26
Digests
26
Catalogs
23
History
23
Biography
17
Directories
16
Passenger lists
15
Census, 10th, 1880
14
Census, 1880
14
Textbooks
13
Correspondence
12
Census, 1870
11
Census, 9th, 1870
11
Early works to 1800
10
Electronic journals
10
Census, 6th, 1840
9
Broadsides
7
Census, 1840
7
Census, 1850
7
Census, 1860
7
Census, 8th, 1860
7
Microform catalogs
7
Newspapers
7
Maps
6
Regulations
6
Statistics, Vital
6
Census, 7th, 1850
5
Claims
5
Handbooks and manuals
5
Périodiques
5
Rules and practice
5
Anti-abolition literature
4
Bibliographie
4
Census
4
more ...