Black Canyon Showing Diversion Tunnel Outlets and Blasting

Front:
BLACK CANYON, HOOVER DAMSITE TV SHOWING DIVERSION TUNNEL OUTLETS AND BLASTING ON CANYON WALLS BUREAU OF RECTION PHOTO watchers FOTOS NA? CAL POW

Back:
POST C Dear minnie) ملت LI 7009 ULDER Bill & may alno Hayes thellian APR12 6-PM 7933 NEV we are on our way out to see Mrs. B. D. Starkweather, Boulder Dam Wish you were the Marlborough", ongl POS 193 pou Everett, leash. 21