T

Technology, engineering, agriculture.

TB

Technology: general issues. General issues: History, inventions…

TBX

History of engineering & technology.

TBY

Inventions & inventors.

TN

Civil engineering, surveying & building. Hydraulic engineering.

TNF

Hydraulic engineering.

TR

Transport technology & trades. Navigation, aviation technology…

TRLN

Navigation & seamanship.

TRP

Aerospace & aviation technology.

TT

Other technologies & applied sciences. Military engineering.

TTM

Military engineering.

TV

Agriculture & farming. Agriculture, apiculture, viticulture…

TVB

Agricultural science.

TVHH

Apiculture (beekeeping).

TVSW

Viticulture.