Endnotes
1. Norris, Scott. "Oldest Horseshoe Crab Fossil Found in Canada."
2. Delaware Department of Natural Resources and Environmental Control. "Green Eggs and Sand, Tri-State Horseshoe Crab/Shorebird Education Project."
3. Hall, William. "Horseshoe Crab Census Information."
4. USGS. "Population Studies of Horseshoe Crab in Delaware Bay."
5. Ecological Research & Development Group. "The Horseshoe Crab. In the News: Delaware Conch Fishermen Successfully Repeal Moratorium on Horseshoe Crab Harvesting."
6. MDNR. "Horseshoe Crabs: A Living Fossil."
7. U.S. Fish & Wildlife. "News Release: Red Knot named candidate for Endangered Specied Act protection."
8. Miller, Mark. "Too Close for Horseshoe Crabs."
9. ERDG. www.horseshoecrab.org
10. ERDG. www.horseshoecrab.org
11. ERDG. www.horseshoecrab.org
12. Howe, Roger. "Taking Place Value Seriously: Arithmetic, Estimation, and Algebra."
13. Howe, Roger. "Taking Place Value Seriously: Arithmetic, Estimation, and Algebra."
14. Howe, Roger. "Taking Place Value Seriously: Arithmetic, Estimation, and Algebra."
15. Swan, Hall, and Shuster. "The Delaware Bay Horseshoe Crab Spawning Survey 2001 Season."
16. MDNR. "Horseshoe Crabs: A Living Fossil."
17. ERDG. www.horseshoecrab.org
18. Air Mobility Command. "C-5 Galaxy."
19. Wikipedia. "Horseshoe Crab."

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