DECIMAL CLASSIFICATION 
380 Commerce Communication 
16 
331 
382 
383 
2 
21 
S22 
»3 
A 
4Q 
384 
385 
Public utilities. The technical side of these questions goes mostly in 650 Useful arts. 
Here belong discussions of social and political relations. 
Theory 
Supply and demand 
Markets in general 
Government control of business and public utilities 
Domestic trade 
Foren trade 
Including trade between mother country and colony 
Official representativs Consulates Consuls 
Consular reports 
Postal servis 
See also 353.4 U. S. administration 
Transport by mail 
Letters, parcel post, etc. 
Postage stamps Postage permits 
Precanceld stamps 
International stamps 
Philately Stamp collections 
Banking by mail 
Money orders; postal orders. See also 332.22 Postal savings banks 
Organization of postal servis 
Government post, private post, postal union 
In special countries 
Divided like 940-999 
Telegraf Cable Telefone 
See also 621.38 and 654 
Telegraf 
Cable 
Radio Wireless 
Telegraf and telefone 
Telefone 
Railroad Express Freight 
Government ownership or control, Interstate commerce commission, See also 650 
Railroading