Mr. Edison at Work in His Chemical Laboratory

5.9

(26)

6.5

(20)

6.2

(9)

5.5

(19)

6.5

(4)

7

(2)

6.3

(8)

7.6

(17)

3.8

(14)

7.1

(508)

7.5

(124)

6.8

(6)

6

(1)

7.5

(4)

5.5

(2)

0

(0)

1

(1)

0

(0)

1.7

(7)

7

(1)