I found the pub. It's the USDA Agricultural Fact Book 1998:
http://www.usda.gov/news/pubs/fbook98/content.htm
Jim
On 2010-10-21 1427, James R. Frysinger wrote:
I was researching planting calendars when I stumbled across this:
http://www.usda.gov/news/pubs/fbook98/append.htm#chart
Obviously there is a lot of rounding off. And I found that there is at
least one error:
To convert this To this Multiply by
feet centimeters(cm) 39
A factor of 30 would have been closer; 30.5 would have been better yet.
The actual factor is 30.48 (exactly).
This seems to come from USDA fbook 98, whatever that is.
Jim
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James R. Frysinger
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