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