File:Secondgrowth Redwood Yield Study. North fork of Gualala River - plot -12 - a 41 year old stand of pure redwood - 110 thousand board feet per acre. Oct. 1922.png
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![File:Secondgrowth Redwood Yield Study. North fork of Gualala River - plot -12 - a 41 year old stand of pure redwood - 110 thousand board feet per acre. Oct. 1922.png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9a/Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_River_-_plot_-12_-_a_41_year_old_stand_of_pure_redwood_-_110_thousand_board_feet_per_acre._Oct._1922.png/685px-Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_River_-_plot_-12_-_a_41_year_old_stand_of_pure_redwood_-_110_thousand_board_feet_per_acre._Oct._1922.png?20180928025752)
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