1. History of the coniferous forests, California and Nevada;Axelrod;Univ. Calif. Publ. Bot.,1976
2. Cenozoic history of some western American pines;Axelrod;Ann. M. Bot. Gard.,1986
3. Les terpenes du pin maritime: aspects biologiques et genetiques. II;Baradat,1972
4. Geographic Distribution of the Pines of the World;Critchfield,1966
5. Impact of the Pleistocene on the genetic structure of North American Conifers;Critichfield,1984