Savannah'shelpful+links

1. http://www.vaes.vt.edu/steeles/mccormick/harvest.html

2. http://astsun.astro.virginia.edu/research/observatories/26inch/history/walnutgrove.html

3. http://www.enchantedlearning.com/inventors/page/m/mccormick.shtml

4. http://www.vaes.vt.edu/steeles/mccormick/harvest.html