Quercus oleoides
- Description of this evergreen tree, with photographs of leaves, flowers and bark.
- http://www.cybertruffle.org.uk/vinales/eng/quercus_oleoides.htm

Key to the Species of Oaks Native to Middle Tennessee
- Summer key for 19 species. Includes images of leaves and acorns.
- http://www2.volstate.edu/JSchibig/key_to_the_species_of_oaks.htm

Quercus petraea
- Information on the Durmast Oak and photographs of its foliage.
- http://www.plant-identification.co.uk/skye/fagaceae/quercus-petraea.htm

Sessile Oak: Quercus petraea
- Illustrated description of this species, its associated wildlife and its timber.
- http://www.forestry.gov.uk/forestry/infd-5nlj46

California Oaks
- Descriptions and pictures of the oaks native to California from Las Pilitas Nursery.
- http://www.laspilitas.com/groups/oaks/california_oak1.html

Common Oaks of Florida
- Descriptions and illustrations of 19 species.
- http://edis.ifas.ufl.edu/BODY_FR004

Oak Key
- Identification keys based on characteristics of acorns or twigs for 12 New England species.
- http://www.hort.uconn.edu/plants/keys/trees/oakkey.htm

Quercus havardii
- Information on distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/shrub/quehav/

Quercus cerris L.
- Collection of pictures of the Turkey oak.
- http://www.bioimages.org.uk/HTML/T1470.HTM

California Oak Mortality Task Force
- Addresses the issue of elevated levels of oak mortality through research, management, education and public policy. Contains monthly updates, distribution maps, symptoms, and educational materials.
- http://www.cnr.berkeley.edu/comtf/

California Oaks Foundation
- Non-profit educational organization committed to preserving the state's oak forest ecosystem and its rural landscapes.
- http://www.californiaoaks.org/

International Oak Society
- Nonprofit organization dedicated to encouraging the study and cultivation of the true oaks (genus Quercus). News, events, and publications.
- http://www.saintmarys.edu/~rjensen/ios.html

Quercus wislizenii
- Distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/quewis/

Quercus shumardii
- Distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/queshu/

Quercus pungens
- Information on distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/quepun/

Quercus palustris
- Distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/quepal/

Quercus oblongifolia
- Information on distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/queobl/

Quercus nigra
- Distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/quenig/

Quercus fontanesii
- Image of foliage and catkins.
- http://www.dipbot.unict.it/orto/0727-1.html

Quercus coccifera
- Photographs of flowering leafy shoots.
- http://www.dipbot.unict.it/orto/0726-1.html

Quercus incana
- Distribution and occurrence; value and use; characteristics; and fire ecology.
- http://www.fs.fed.us/database/feis/plants/tree/queinc/