Their average annual salary in larger cities was $1390 .
The role of public health nurse began in Los Angeles in 1898 , by 1924 there were 12,000 public health nurses , half of them in the 100 largest cities .
nurses ' average annual salary in larger cities was $1390 .
The role of public health nurse began in Los Angeles in 1898 , by 1924 there were 12,000 public health nurses , half of them in the 100 largest cities .