Those were the only times when we used a bit of coal.

Also there was the question of coal to be considered.

I want to consider for a moment the true price of coal.

I'll make each man take out a certain amount of coal.

In the green light it looked black and dead, without color, almost like a piece of coal.

At one point, the city had only a week's supply of coal left.

At every stage in the use of coal there are serious environmental, social and health problems.

At one time the price of the world's coal was determined here.

The other four used a mix of oil and coal.

They seemed to be going down a long hall, black as the inside of coal, then turned a corner and stopped.