DECIMAL CLASSIFICATION 
634.9 
Forestry 
The following expansion is based on the Forestry classification prepared by a 
committee of the Society of American Foresters and publisht in Journal of forestry, 
Feb. 1923, 21: 152-61 
Theory 
General conception, nature and extent 
Classification 
Value Importance Usefulness 
Nomenclature Terminology 
For discussion only. Dictionaries and glossaries ar clast under 634.003 
Compends 
Dictionaries Cyclopedias 
Essays Addresses Lectures 
For general collections only; if, either singly or collected, they ar on a special 
topic they ar clast with that topic 
Periodicals 
Yearbooks Directories 
Kalendars Almanacs 
Associations Societies 
Official organizations Government departments, etc, 
For experiment stations see 634.9072 
Unofficial organizations 
Congresses Conferences 
Education Study and teaching 
Forestry schools 
Experiment stations 
Polygrafy Collections 
History and general local treatment 
0001 Comparativ study (national practises); .0093-9 divided like 930-999 
Economics 
Forest influence: geophysic 
On climate 
“ soil 
“ water resources and stream flow 
“ erosion 
“ avalanches 
Forest influence: social 
On public helth 
“ ethics and morals 
esthetics 
Better clast by general libraries in 713 
Forest parks 
City parks and shade trees 
Relation to industries 
Subdivided by industry like 620-699; e.g. 634.9242 Relation to mining; 
634.92476 Relation to paper making. For industries not included in 620-699 
use 0241 subdivided like main classification 
902 
903 
904 
[070] 
2 
) 
0b 
307 
908 
009 
02 
022 
322 
“7 
52 
64 
324