| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Perpetuation of Living Beings; hereditary transmission and variation | Huxley, Thomas Henry, 1825-1895 | en | | | | | 2001-11-01 |
| The Variation of Animals and Plants Under Domestication, Vol. I. | Darwin, Charles, 1809-1882 | en | | | | Plants, Cultivated; Variation (Biology); Domestic animals | 2008-03-27 |
| Geographic Variation in the Pocket Gopher, Cratogeomys castanops, in Coahuila Mexico | | en | | | | | 2010-05-31 |
| Kyphosis and other Variations in Soft-shelled Turtles | Smith, Hobart M. | en | | | | | 2010-08-08 |
| Geographic Variation in Red-backed Mice (Genus Clethrionomys) of the Southern Rocky Mountain Region | | en | | | | | 2010-06-04 |
| Geographic Variation in the Harvest Mouse, Reithrodontomys megalotis, On the Central Great Plains And in Adjacent Regions | | en | | | | Reithrodontomys; Animals -- Variation | 2009-08-01 |
| The Variation of Animals and Plants Under Domestication, Volume II (of 2) | Darwin, Charles, 1809-1882 | en | | | | Domestic animals; Plants, Cultivated; Variation (Biology) | 2009-05-20 |
| Round Games with Cards
A Practical Treatise on All the Most Popular Games, with Their Different Variations, and Hints for Their Practice | Peel, W. H. | en | | | | | 2009-01-16 |