The letter, which has not previously been made public, also recommended that the company hire a more experienced chief financial officer.
The letter also recommended that the daily, or acute exposure standard, be further reduced.
A letter recommending me for a position in the astronaut training corps.
And here is a letter recommending you to my brother, Sir Edward.
A second letter, to an executive at Coca-Cola, recommended a cousin for a job that was never offered.
I will give you a letter for Plato, recommending you as a man who has my confidence.
The letter ordered the center to make 16 changes in its practices to comply with the law and strongly recommended 7 other changes.
"I've gotten almost 50 books, hundreds of letters recommending all kinds of stuff," he said.
"And he did write a letter recommending her."
The letter recommended "the speedy termination of his employment."