Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 622
oplane must have not one ortwo, but four or five, propellers, the extra onesto be on hand in case of breakage; and this coun- try is setting out to build aeroplanes by the tensof thousands. It takes one hundred board feetof walnut to make a single propeller. Add tothis the supply needed for… … A BLACK-WALNUT TREE OF MONTGOMERY COUNTY, MARY-LAND. HEIGHT ABOUT 150 FEET. be no mean order if we possessed whole forestsof these trees. But while the trees no longer exist in entiregroves, as they once did, yet the authorities knewthat there must still be hundreds of thousands 984 FOR COUNTRY AND…
Children's literature
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