Which literary devices are used in Edgar Lee Master's poem "Lucinda Matlock"?

Although her voice is depicted to us with a marked lack of literary devices, she does use some imagery to illustrate the intense enjoyment that she takes in nature, and this is reflected in the following image:

Rambled over the fields where sang the larks,

And by Spoon River gathering many a shell

And many a flower and medicinal weed--

Shouting to the wooded hills, singing to the green valleys.

This is a powerful example of imagery that presents to us Lucinda's fierce and intimate attachment with nature. She is clearly shown to be a woman who is happiest when rambling around in the countryside and by herself, and these lines create a powerful image of the way that she relates to nature through the picture it creates of Lucina shouting and singing to the nature around her.