8 DEPARTMENT OF AGRICULTURE BULS. 1276-1300 



Department Bulletin No. 1291. — Aspen in the Central Rocky 

 Mountain Region: 



Introduction 



Distribution 



The tree ' 



Leaves 



Flowers and seed 



Form 



Bark 



Root system 



Climatic requirements 



Soil and moisture requirements .. 



Quality sites 



Tolerance 



Susceptibility to injurious factors 



Fungi 



Insects 



Mammals 



Fire 



Climatic factors 



Reproduction 



Reproduction of conifers associated with aspen 



The stand 



Associated species 



Growth 



Height growth 



Diameter growth 



Volume growth . 



Yield 



Thinning 



Properties of the wood 



Uses 



Lumbering and logging 



Management of aspen, silvicultural systems 



Relative values of aspen and conifers in management 



Transformation of aspen type 



Applied management in the field 



Appendix 



Bibliography 



Department Bulletin No. 1292. — -Field and Crop Labor on 

 Georgia Farms (Coastal Plains Area) : 



Introduction 



Description of area 



Crew performance 



Average amount of labor per acre on different crops 



Distribution of labor 



Common operations preparatory to planting most crops 



Individual crop operations 



Cotton 



Corn 



. Peanuts 



Sweet potatoes 



Sugar cane , 



Cowpeas 



Oats, wheat, and rye 



Watermelons 



Hay 



Department Bulletin No. 1293. — Tillage and Rotation Experi- 

 ments at Dickinson, Hettinger, and Williston, N. Dak.: 



Introduction 



Climatic conditions of the region 



Precipitation 



Evaporation 



Temperature 



