File:Secondgrowth Redwood Yield Study. North fork of Gualala - plot -4. A 39 year old stand of pure redwood - 56 M.B.M. per acre. D. Bruce - Oct. 1922.png
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![File:Secondgrowth Redwood Yield Study. North fork of Gualala - plot -4. A 39 year old stand of pure redwood - 56 M.B.M. per acre. D. Bruce - Oct. 1922.png](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_-_plot_-4._A_39_year_old_stand_of_pure_redwood_-_56_M.B.M._per_acre._D._Bruce_-_Oct._1922.png/686px-Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_-_plot_-4._A_39_year_old_stand_of_pure_redwood_-_56_M.B.M._per_acre._D._Bruce_-_Oct._1922.png?20180928041614)
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