Spencer, Herbert, 1820-1903
The principles of ethics / Herbert Spencer ; introduction by Tibor R. Machan
The principles of ethics / Herbert Spencer ; introduction by Tibor R. Machan
. - xxa Indianopolis xxa-fimyyc Liberty Classics yyc-fim, cop. 1978
. - 2 vol. (613, [1] ; 521, [1] p.) 23 cm
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