SKINNER, B. J. Physical geology#Brian J. Skinner, Stephen C. Porter. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)SKINNER, Brian J. Physical Geology#Brian J. Skinner, Stephen C. Porter. John Wiley & Sons.
Lua MLA (8ú heag.)SKINNER, Brian J. Physical Geology#Brian J. Skinner, Stephen C. Porter. John Wiley & Sons.
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