Special Agents Series, 第 165-169 期U.S. Government Printing Office, 1918 |
搜尋書籍內容
第 1 到 5 筆結果,共 100 筆
第 7 頁
... supply is estimated at 168,000,000 tons . Less than 1,000,000 tons are cut annually at present . The quebracho is never found in pure stands . It is scattered through open forests containing , as a rule , a large variety of species . It ...
... supply is estimated at 168,000,000 tons . Less than 1,000,000 tons are cut annually at present . The quebracho is never found in pure stands . It is scattered through open forests containing , as a rule , a large variety of species . It ...
第 17 頁
... supply of tanning materials . Hitherto the chief sources of mangrove bark have been Portuguese East Africa , Madagascar , and the East Indies ( Celebes , Borneo , etc. ) . The bark of the mangrove growing naturally in these regions is ...
... supply of tanning materials . Hitherto the chief sources of mangrove bark have been Portuguese East Africa , Madagascar , and the East Indies ( Celebes , Borneo , etc. ) . The bark of the mangrove growing naturally in these regions is ...
第 23 頁
... supply of tan- ning materials , the forests of Paraguay alone should be able to con- tribute notably toward meeting the demands of international com- merce . BARKS OF ARGENTINA . As already mentioned , the bark of the true quebracho ...
... supply of tan- ning materials , the forests of Paraguay alone should be able to con- tribute notably toward meeting the demands of international com- merce . BARKS OF ARGENTINA . As already mentioned , the bark of the true quebracho ...
第 31 頁
... supplies annually 500 tons , and the output could be notably in- reased . There is an unfortunate tendency in some ... supply of tanning agents . ( Journal the American Leather Chemists ' Association , 1914 , vol . 9 , 214. ) Paullinia ...
... supplies annually 500 tons , and the output could be notably in- reased . There is an unfortunate tendency in some ... supply of tanning agents . ( Journal the American Leather Chemists ' Association , 1914 , vol . 9 , 214. ) Paullinia ...
第 31 頁
... supply of water for domestic and stock use , providing for an area of land nearly 21,000 square miles in extent ... supply water to the famous gold fields of Coolgardie and Kalgoorlie . Its existence , how- ever , has made possible the ...
... supply of water for domestic and stock use , providing for an area of land nearly 21,000 square miles in extent ... supply water to the famous gold fields of Coolgardie and Kalgoorlie . Its existence , how- ever , has made possible the ...
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