Figure 1. Number of greenhouse vegetable operations in the US from 1978 to 1997, according to the 1982, 1987, 1982 and 1997 editions of the US Census of Agriculture.
Figure 1. Number of greenhouse vegetable operations in the US from 1978 to 1997, according to the 1982, 1987, 1982 and 1997 editions of the US Census of Agriculture.
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