How does William E. Leuchtenburg use imagery in Franklin D. Roosevelt and the New Deal, 1932-1940?

Example of Imagery:

"At least a million, perhaps as many as two million were wandering the country in a fruitless quest for work or adventure or just a sense of movement. They roved the waterfronts of both oceans, rode in cattle cars and gondolas of the Rock Island and the Southern Pacific, slept on benches in Boston Commons and Lafayette Square, in Chicago's Grant Park and El Paso's Plaza. From Klamath Falls to Sparks to Yuma, they shared the hobo's quarters in oak thickets strewn with blackened cans along the railroad tracks. On snowy days, as many as two hundred men huddled over fires in the jungle at the north end of the railway yards in Belen, New Mexico. Unlike the traditional hobo, they sought not to evade work but to find it. But it was a dispirited search. They knew they were not headed toward the Big Rock Candy Mountain; they were not, in fact, headed anywhere, only fleeing from where they had been."