FOREWORD 



Ponderosa pine ( Pinus ponderosa Laws.) is one of the most important softwood 

 species in the United States. Because of its extensive range and economic impor- 

 tance, considerable research has been conducted on this valuable species. The 

 published results of these research efforts provide an impressive number of ref- 

 erences. This paper adds to and updates through 1965 the bibliography by Arthur L. 

 Roe and Kenneth N. Boe ( 1631 ). This revised edition was compiled at the Boise 

 project headquarters of Intermountain Forest and Range Experiment Station. 



References have been limited to published material such as printed and proc- 

 essed reports; unpublished theses and typewritten reports have been omitted. A 

 search of foreign Literature has not been made, although a few foreign publications 

 have been included. Most popular-type articles were intentionally omitted. 



The subject index follows the scheme suggested in Forest Service Handbook 

 1673.1, "Organizing collections by Oxford System . " In a few cases the index was 

 sbightly modified to simplify the presentation of subject matter. Articles were in- 

 dexed under what was considered the principal topic , but no reference was listed 

 under more than three subjects. 



This bibliography has been compiled primarily for Silviculturists; therefore 

 material pertaining to forest pests has been indexed under "Forest Damage and Pro- 

 tection." Many articles in these categories deal with both damage and control and 

 therefore these subjects have been consolidated under one heading. Only articles 

 dealing primarily with control were indexed under "Protection." 



The author would appreciate information concerning errors or omissions. 

 These should be forwarded to the Boise office of the Intermountain Forest and Range 

 Experiment Station. 



The author gratefully acknowledges the valuable assistance of James D. Curtis 

 and Marvin W. Foiles in compiling and indexing this paper; and of the Pacific 

 Northwest, Pacific Southwest, and Rocky Mountain Forest and Range Experiment 

 Stations in checking the titles for completeness and accuracy. 



