* ''Earth-hunger and other essays'' , ed. Albert Galloway Keller (1913) [http://books.google.com/books?id=wWJN3l36B_oC&printsec=frontcover&dq=inauthor:william+inauthor:graham+inauthor:sumner&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&num=30&as_brr=1&as_pt=ALLTYPES full text online] | * ''Earth-hunger and other essays'' , ed. Albert Galloway Keller (1913) [http://books.google.com/books?id=wWJN3l36B_oC&printsec=frontcover&dq=inauthor:william+inauthor:graham+inauthor:sumner&lr=&as_drrb_is=q&as_minm_is=0&as_miny_is=&as_maxm_is=0&as_maxy_is=&num=30&as_brr=1&as_pt=ALLTYPES full text online] |