National Geographic : 1931 May
©Chicago Aerial Survey Company INDUSTRIES OF ENORMOUS MAGNITUDE CENTER ABOUT THE STOCKYARDS OF CHICAGO Of this phase of Chicago's activities, the term "greatest in the world" may well be used. The yards encompass miles of streets and hundreds of miles of railway tracks and receive millions of head of livestock each year. Not only slaughtering and meat-packing are associated with them, but many by products as well. Here originated the apt phrase that "within 15 minutes after going in, a pig comes outashair, sausage, hair oil, and the binding for a book" (see text, page 581).