The Common Sand Dollar
- Brief information about where to find sand dollars.
- http://octopus.gma.org/Tidings/sanddollar.html

Wikipedia: Sand dollar
- Pictures and information about a variety of these marine animals.
- http://en.wikipedia.org/wiki/Sand_dollar

Enchanted Learning: Sand Dollar
- Features a print out and facts about the spiny-skinned, coin shaped animals that live on the sea floor.[echinoderm]
- http://www.enchantedlearning.com/subjects/invertebrates/echinoderm/Sanddollarprintout.shtml