Artificial Reefs: Pratte's Reef
- Construction specifications and resources related to Pratte's Reef.
- http://www.surfrider.org/artificialreef/artificial_reefs.htm

U.S. Fish and Wildlife Service
- Species profile regarding the endangered El Segundo blue butterfly.
- https://ecos.fws.gov/species_profile/SpeciesProfile?spcode=I00C

Tree Musketeers
- Local chapter of the nation's first youth environmental organization. A nonprofit charity where kids are boss.
- http://www.treemusketeers.org/

Blue Butterfly
- Photograph, description and habitat.
- http://shanana.berkeley.edu/essig/endins/euphilot.htm

The Glide: Pratte's Reef
- Information and links to related sites.
- http://www.theglide.com/news/news.php?threadid=1&page=3

Influence on Santa Monica Bay
- Impacts and related links regarding Chevron's oil refinery.
- http://www.bol.ucla.edu/~tandaman/