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Culture
Orchid Doctor
by Robert M. [Bert] Hamilton (Compiler)
Originally published in The Orchid Doctor in 1980 and 1988
Posted by
Sys Admin
over 7 years ago.
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Ideally, the air space between two covers should be approximately one and a half inches thick; spaces of three-quarters to eight inches are used; below three-quarters inch the effectiveness is rapidly lost. A64-548
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