ILLUSTRATION 73 



APPROXIMATE WORK UNITS NEEDED FOR THE PRODUCTION OP 

 CROPS AND IN CARING FOR LIVESTOCK, KTC; A WORK I'.MT 



BEING A 10-HOUR DAY OF MAN OR HORSE 



J U. S. Dcpt of Agriculture Farmers' Bulletin No. 661. 

 * Production in this case includes both the technical production cost 

 and the harvesting cost. 



378 



