. Annual report of the Director of the Bureau of Science ... Philippines. Bureau of Science; Science -- Philippines. Twelfth Annual Report of the Bureau of Science—1913.]. PLATE L. CONE FROM CRUSHED CUBE OF CONCRETE FROM ABATAN RIVER, CORTES, BOHOL, SHOWING EFFECT OF USING GRAVEL COVERED WITH GREEN Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Philippines. Bureau of Science. Manila : Bureau of Printing

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishermanil, bookyear1906