Genre
Sources
22
Textbooks
19
Periodicals
5
Biography
3
Congresses
3
Statistics
3
Census, 10th, 1880
2
Census, 1850
2
Census, 1860
2
Census, 1870
2
Census, 1880
2
Census, 7th, 1850
2
Census, 8th, 1860
2
Census, 9th, 1870
2
Genealogy
2
Guidebooks
2
History
2
Archives
1
Case studies
1
Directories
1
Early works to 1800
1
Exhibitions
1
Pictorial works
1