That is presumably why the theory considered only agricultural labor to be valuable.

Students were to build character and meet a part of their expenses by performing agricultural labor.

Most of the land owners hired farm hands for agricultural labor.

This system gave most of the agricultural labor during the Middle Ages.

They used to do most of the routine agricultural labor.

The men limited their agricultural labor to clearing the field and breaking the soil.

But the great demand for agricultural labor is in the summer.

With many young men off to war there was a gap in agricultural labour that needed to be filled.

His father was dedicated to the agricultural labor of the estate in which he lived.

Most agricultural labor on the island was driven by slaves from Africa.