How many bird books were published by Neltje Blanchan in the 1900s?
5
2
3
2
3
2
3
2
3
2
3
1
2
3
1
2
3
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
2
3
4
1
5
4
6
1
0
5
4
6
1
5
0
4
6
1
5
0
4
6
1
5
7
4
6
0
5
7
4
6
5
0
7
4
6
5
7
0
6
5
7
6
8
0
5
7
6
8
2 Volumes
5
0
7
6
8
5
2 Volumes
7
0
6
8
5
7
6
8
2 Volumes
0
2 volumes
7
6
8
9
0
2 Volumes
7
6
8
a dozen
2 volumes
9
7
0
10
6
8
2 Volumes
9
7
a dozen
10
11
6
8
0
2 volumes
9
2 Volumes
7
10
11
6
8
a dozen
9
0
1 bird book
7
10
11
6
8
2 Volumes
2 volumes
9
7
a dozen
10
11
6
8
9
1 bird book
2 Volumes
7
10
11
ten