Spoilers of the Plains (1951) ROY ROGERS Penny Edwards 

Roy runs a pipline near the spot where a professor and his daughter are experimenting with long-range weather forecasting by using rockets. However, a group of crooks has their eye on the rockets for another purpose. Roy comes to the rescue and ends up battling it out on an oil derrick.
This is the cut version of the film. The original is approx. 68 minutes.
Starring
ROY ROGERS
PENNY EDWARDS
GORDON JONES
GRANT WITHERS
FOY WILLINGS & THE RIDERS OF THE PURPLE SAGE
and
TRIGGER, The Smartest Horse in the Movies