Useful Arts 
Applied Science 
TOW 
600 
601 
602 
Useful arts Applied science 
Filosofy = Theories, etc. 
Compends, outlines 
Dictionaries, cyclopedias 
Essays, lectures, addresses 
Periodicals, magazines, reviews 
Societies Fairs Exhibitions 
Special exhibitions go with their topics. This is general only 
607 Education Schools of technology 
Divided like 040-090 
608 Patents Inventions 
600 History of useful arts in general 
For its history, ces each special department 
o 636 
nle fcr 
Hoon 
11