How is it possible to have a blank diff? E.g. http://upstream.openlibrary.org/books/OL17889439M/Introdu%C3%A7%C3%A3o_%C3%A0_hist%C3%B3ria_da_antropologia_ind%C3%ADgena_no_Brasil_s%C3%A9culo_16.?m=diff&b=4
How is it possible to have a blank diff? E.g. http:// upstream. openlibrary. org/books/ OL17889439M/ Introdu% C3%A7%C3% A3o_%C3% A0_hist% C3%B3ria_ da_antropologia _ind%C3% ADgena_ no_Brasil_ s%C3%A9culo_ 16.?m=diff& b=4