"The method proposed consists of taking photographs of certain marked sample areas and later repeating the operation to show trend of vegetation changes. A general and closeup view is taken at each point to record conditions important in each selected area. The method is especially suited to illustrate changes in vegetation and soil erosion over ranges where management problems exist and on areas where soil and moisture improvements have been placed. The before and after pictures constitute evidence of the results with a minimum of field and office work. They can readily be interpreted by stockmen and technical personnel since they represent views at angles ordinarily taken during an inspection on the ground. The development of each plant can be traced and changes in vegetative cover correlated with management and climatic factors. The method can be made most effective by uniformity and technique."--Pages 2-3.