| civil war |
4,090,000/mo |
$0.66 |
| ancient egypt |
1,220,000/mo |
$0.74 |
| ancient greece |
1,220,000/mo |
$0.56 |
| the great depression |
823,000/mo |
$4.04 |
| salem witch trials |
246,000/mo |
$0.72 |
| american civil war |
368,000/mo |
$0.75 |
| abe lincoln |
1,220,000/mo |
$0.71 |
| sign language |
2,240,000/mo |
$0.89 |
| power of attorney |
1,500,000/mo |
$1.34 |
| florence nightingale |
368,000/mo |
$0.64 |
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| dead sea scrolls |
90,500/mo |
$0.60 |
| resume writing |
368,000/mo |
$2.66 |
| learn spanish |
550,000/mo |
$2.53 |
| pope benedict xvi |
49,500/mo |
$0.61 |
| ellis island immigration |
22,200/mo |
$1.33 |
| criminal records |
1,500,000/mo |
$1.28 |
| roman history |
110,000/mo |
$0.88 |
| the bible |
20,400,000/mo |
$0.73 |
| the oregon trail |
450,000/mo |
$0.28 |
| egyptians |
20,400,000/mo |
$0.98 |
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