Randy,
Here is the reference you want for information and then some.....................Title: The Thermology of Wintering Honey Bee Colonies, Technical Bulletin #1429, by Agric Research Svc/USDA issued Novembver 1971 Wash, DC and for sale by the superintendent of documents, US Gov printing ofc, Wash, Dc 20402 'stock number 001-000-01295-9 catalog number A 1.36:1429................and last known price I have stated by gov is: .65cents for booklet 32 pages long.
Dee A. Lusby
p.s. you'll love it.............for it goes way beyond laying out with temps and other for hive dynamics for overwintering...........................
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