128 ENGINEERING ON THE FARM 



are made by national and state agencies to have lumber 

 companies utilize all of the timber-producing trees cut, 

 protect growing trees, leave at frequent intervals seed- 

 producing trees, and clean up the brush in order that forest 

 fires may not destroy the young growth. 



BIBLIOGRAPHY 



"Deterioration of Lumber," Bulletin 252, California Agricultural 

 Experiment Station, Berkeley. 



Goss, William F. M. Bench Work in Wood. Ginn & Co. 



Hicks, Isaac P. Builders' Guide. David Williams Co. 



Kellogg, Royal S. Lumber and Its Use. Radford Architectural Co. 



Richey, Harry G. The Building Mechanics' Ready Reference. Car- 

 penters' and Woodworkers' Edition. John Wiley & Sons. 



Selden, Frank H. Elementary Cabinet Work for Manual Training 

 Classes. Rand McNally & Co. 



Selden, Frank H. Elementary Woodwork. Rand McNally & Co. 



Wheeler, Charles G. Woodworking for Beginners. Putnam. 



Windsor, Henry H. Mission Furniture, How to Make It. Popular 

 Mechanics Co. 



GOVERNMENT publications 



"How Lumber Is Graded," Forest Service Circular 64, United States 



Department of Agriculture. 

 "Mechanical Properties of Wood Grown in the United States," Forest 



Service Bulletin 336. 



