It is estimated that 558,000 workers are potentially exposed to Cr(VI) in the United States. Workers in a variety of occupations are potentially exposed to Cr(VI). Workplace exposures occur mainly in the following areas: Welding and other types of hot work on stainless steel and other metals that contain chromium.
I've read every novel by Dean Koontz, and I would put WINTER MOON in the bottom third. This is not a terrible novel, but it's very slow paced in the middle and the ending is not particularly satisfying.
An example of these moon-letters would be on the map of the Lonely Mountain (Erebor) and surrounding areas that Gandalf gave to Thorin Oakenshield. The moon letters were the more cunning type mentioned above, and they were written on a midsummer's eve in a crescent moon.