Chemistry of pulp and paper making . Plate 23 Sweet Gun. iL^,,a,„, ,^,^^) Magnification .00 dian^eters Photographed by Bureau of Plate 24 Hard or Sugar Maple (Acer saccharum) Magnification 100 by Bureau of Standards.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1920