and

body

bulldozer

car

career

caterpillar

cliffnn

coal

combine

development

digging

dump

energy

engineer

engineering

enrichment

enterprise

equipment

excavator

factory

from

frost

geodesy

geology

giant

industry

into

iron

knots

labor

large

machine

machinery

mine

miner

mining

mountains

open

ore

outdoors

parts

pour

pours

powerful

production

profession

quarry

rocks

rope

severe

size

soil

sorting

stones

technique

tipper

tons

tractor

truck

useful

volume

winter

work