r.out.tif help

I'm using r.out.tif, but it doesn't come with a g.manual entry.
Where can I find more complete help than

r.out.tif help

Thanks,
Allan Axon

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Ohio Department of Natural Resources |
Division of Geological Survey |
Coal Geology Group | Phone: 614-265-1030
4383 Fountain Square Dr. | FAX: 614-447-1918
Columbus, OH 43224-1362 |
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Internet: allan.axon@dnr.ohio.gov
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