How many of David McCullough's books won a Pulitzer Prize?
2
1
1
1
1
1
1
2
1
2
1
2
1
2
1
2
1
2
1
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
3
2
1
4
3
2
4
3
2
4
3
2
4
3
2
4
3
2
4
3
2
4
3
5
4
3
5
4
3
5
4
3
5
4
3
0
5
4
3
0
5
4
3
0
5
4
5
4
0
5
4
7
0
6
5
4
7
6
0
5
4
7
6
5
4
0
7
6
5
4
7
0
6
5
7
6
5
7
6
5
7
8
6
5
7
8
6
5
7
8
6
5
7
8
6
5
7
8
6
9
7
8
No
6
9
7
8
No
6
9
7
8
No
6
9
7
8
No
6
13
9
10
7
One
8
No
6
13
11
9
10
7
One
8
No
6
13
11
9
10
7
One
8
No
6
13
11
9
10
7
One
8
No
6
13
11
9
10
One
8
No
13