- EbookThe Earth as Modified by Human ActionGeorge P. Marsh
- EbookThe Whelps of the WolfGeorge P. Marsh
- EbookMan and Nature; Or, Physical Geography as Modified by Human ActionGeorge P. Marsh
- EbookMan and Nature; Or, Physical Geography as Modified by Human ActionGeorge P. Marsh
- EbookMan and NatureGeorge P. Marsh
- EbookThe Earth as Modified by Human ActionGeorge P. Marsh