File:Secondgrowth Redwood Yield Study. North fork of Gualala - plot -7. A 40 year old stand of pure redwood, 89 M.B.M. per acre. D. Bruce - Oct. 1922.png
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![File:Secondgrowth Redwood Yield Study. North fork of Gualala - plot -7. A 40 year old stand of pure redwood, 89 M.B.M. per acre. D. Bruce - Oct. 1922.png](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_-_plot_-7._A_40_year_old_stand_of_pure_redwood%2C_89_M.B.M._per_acre._D._Bruce_-_Oct._1922.png/686px-Secondgrowth_Redwood_Yield_Study._North_fork_of_Gualala_-_plot_-7._A_40_year_old_stand_of_pure_redwood%2C_89_M.B.M._per_acre._D._Bruce_-_Oct._1922.png?20180928160943)
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