"I suspect his call for additional volunteers is just a bluff."

In my spare moment, I have arranged for the enlistment of additional volunteers.

There is insufficient money to run enough training sessions for additional volunteers.

In a 24-hour period, 2000 students and thousands of additional volunteers surveyed the park for every available living species.

The first was a press release saying what we were doing, where, and when, and inviting additional volunteers.

And be sure to register your project at Serve.gov to find additional volunteers.

There are an additional 4,200 civilian volunteers, 900 reserve deputies and 400 explorers.

Two weeks later, on May 3, 1861, Lincoln called for an additional 42,034 volunteers for a period of three years.

Catholic and Buddhist institutions provided additional volunteers as did several embassies.

An additional 350 volunteers serve in occasional one-day service events.