ACKNOWLEDGMENT OF ILLUSTRATIONS 
The following list indicates the sources of illustrations 
that are not the property of the authors and publishers. 
Numbers refer to the Figures. 
The Agricultural Extension Department of the Inter¬ 
national Harvester Company:—Figures 1, 2, 3, 9, 13, 22, 
23, 24, 25, 33, 39, 56, 61, 62, 82, 83, 84, 85, 86, 87, 88, 89, 
114a, 114b, 117b, 118, 119, 120, 126, 128, 132, 135, 162a 
162b, 163, 166, 167. 
Oklahoma A. & M. College, Hereford, Brae Repeater, 
Figure 51. 
Stark Brothers Nursery and Orchard Co., Louisiana, 
Mo., Figure 145. 
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