ScienceJohn Michels (Journalist) 1959 |
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Стр. 145
... deposits have an abundance of wood fibers , since most rivers transport great quantities of wood to the sea . In the swamps bordering some river channels future thin coal beds may be forming . Fossils other than wood are scarce in ...
... deposits have an abundance of wood fibers , since most rivers transport great quantities of wood to the sea . In the swamps bordering some river channels future thin coal beds may be forming . Fossils other than wood are scarce in ...
Стр. 157
... deposits , about which a great wealth of descrip- tive information is available , but Borch- ert makes frequent allusions to potash deposits elsewhere for purposes of com- parison . The treatment of many exam- ples from different points ...
... deposits , about which a great wealth of descrip- tive information is available , but Borch- ert makes frequent allusions to potash deposits elsewhere for purposes of com- parison . The treatment of many exam- ples from different points ...
Стр. 172
... deposits to the vicinity of the Chippewa River . The next day , glacial deposits of pre - Cary age were examined in the vicinity of Eau Claire . Research that led to the field confer- ence was started in the fall of 1956 , with the ...
... deposits to the vicinity of the Chippewa River . The next day , glacial deposits of pre - Cary age were examined in the vicinity of Eau Claire . Research that led to the field confer- ence was started in the fall of 1956 , with the ...
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