Alcoa Covered Hoppers

Steve and Barb Hile

In the late 1930's Pullman Standard built 85 interesting large covered hopper cars for Aluminum Corporation of America, AOCX 1200-1284, for alumina loading.  These large cars had 10 bottom hoppers (5 on each side of the center sill) and 6 rectangular hatches on the roof. 
Has anyone seen a photo of one of these cars?  Source?  On-line?
They appear to be big, like a carbon black car.
Thanks in advance for any assistance.
Steve Hile

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