UNITED STATES DEPARTMENT OF Ar.R if III Tl IPF . 



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FOREST SERVICE 



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O C D E N 



UTAH 



No. 60 



October 1958 



STEREOGRAMS IN PONDEROSA PINE 



Karl E. Moessner 

 Division of Forest Economics 



A new series of 39 stereograms prepared by the Intermountain Forest and 

 Range Experiment Station illustrates ponderosa pine and accompanying species 

 found in national forests of southern Idaho, Colorado, and the Black Hills of 

 South Dakota. These stereograms (fig. 1) are the combined vertical and hori- 

 zontal type explained in Research Note 36, "Combined Vertical and Horizontal 

 Stereograms." They allow the user to study both aerial and ground views at 

 the same orientation of the stereoscope. 



Photo interpreters have found the photo data and measurements coupled 

 with volumes from the plots measured on the ground of considerable value in 

 controlling type mapping. The brief stand description and indication of soil, 

 site, and age class have been planned to help forest managers. 



The 39 stereograms in this new series cover a variety of conditions in 

 stand size, density, age, and site. Many of them show stands having two or 

 more age classes. Some illustrate the appearance of pole stands 20 years 

 after thinning; others, the restocking of old burns and logged areas Most 

 of the stereograms have annotations for two plots. Although designed as train- 

 ing aids for new interpreters and reference material for more experienced men, 

 these stereograms will prove useful to any forester desirous of increasing his 

 familiarity with ponderosa pine. 



These stereograms in ponderosa pine are available for: 



Boise Experimental Forest, Idaho 



1 stereogram, aerial photo scale 1:4,300 



4 stereograms aerial photo scale 1:14,000 



4 stereograms, same as above, reduced to 1:20,000. 



San Juan Forest, Colorado 



11 stereograms, aerial photo scale variable 1:20,000. 



