The site became part of the park system in 1931.

In fact, less than 4 percent fall under the national park system.

"Does it need to be in the national park system?"

One is the national park system, which has taken a beating.

The late 19th century saw the development of the city's first comprehensive park system.

They created a comprehensive plan for the city's park system in 1927.

But the company is new to the park system, something officials said did not pose a problem.

His influence was key in setting up Chicago's modern park system.

The more people there are, the greater the strain on the park system.

But none of the park system's 387 employees has been laid off.