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Figure 16.20--Volume of growing stock on timberland by forest-type group and year, Southern United States.

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Volume by forest type group for the years 1989 and 1999 (billion cubic feet):

Forest type group	1989	1999
White-red-jack pine	1.327	1.778
Spruce-fir	0.025	0.016
Planted longleaf-slash	5.610	6.283
Natural longleaf-slash	8.960	7.450
Planted loblolly-shortleaf	9.877	17.791
Natural loblolly-shortleaf	54.224	47.261
Oak-pine	30.348	32.846
Oak-hickory	72.895	82.057
Oak-gum-cypress	43.530	46.511
Elm-ash-cottonwood	3.700	2.733
Maple-beech-birch	0.719	0.833
Nontyped	0.163	0.040