2 adverbs to describe how to manual

MATTHEWS, CHARLES D. A manual of Bible history.

By hand-picking, or by a process strictly manual, a cultivator could not prepare for market, during the year, more than from 200 to 300 pounds; being only about one-tenth of what he could cultivate to maturity in the field.

2 adverbs to describe how to  manual  - Adverbs for  manual