Andrew Carnegie recommended this in "The Gospel of Wealth" (written in 1889): http://digital.library.cornell.edu/cgi/t/text/pageviewer-idx?c=nora;cc=nora;rgn=f

Andrew Carnegie recommended this in "The Gospel of Wealth" (written in 1889): http://digital.library.cornell.edu/cgi/t/text/pageviewer-idx?c=nora;cc=nora;rgn=full%20text;idno=nora0148-6;didno=nora0148-6;view=image;seq=0661;node=nora0148-6%3A1 http://digital.library.cornell.edu/cgi/t/text/pageviewer-idx...