Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Cook Brothers. Front View, Black and White Image of a Driver-Only Unit in Icy Conditions with Driver Seated.

Black & White Image of Cook Tractor-Only on Snow-Covered Parking Lot Adjacent to Building.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.

Caption Missing. Click to us identify this photograph.