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English thesaurus
First-class Nonpresort rate category abbreviation on letter mail key line
abbr., post	FN

First-class: 159 phrases in 33 subjects

Advertising	1
Agriculture	3
Animal husbandry	1
Architecture	1
Automobiles	1
Aviation	8
Bridge construction	3
Business	15
Chemistry	1
China	2
Commerce	5
Communications	1
Compressors	2
Earth sciences	3
Ecology	1
Economy	18
Electronics	3
Exhibitions	2
Finances	1
General	22
Hydroelectric power stations	2
International trade	13
Metallurgy	5
Rail transport	1
Securities	5
Shipbuilding	2
Skiing	1
Space	2
Sports	4
Submarines	1
Technology	22
Telecommunications	2
Textile industry	5