61
Scientific American
| Project Gutenberg |
2012
E-Book
62
Scientific American
| Project Gutenberg |
2012
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63
Scientific American
| Project Gutenberg |
2012
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67
68
Schoolcraft, Henry Rowe
| Project Gutenberg |
2012
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69
Brinton, Daniel Garrison
| Project Gutenberg |
2012
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70
Bryant, William Cullen
| Project Gutenberg |
2012
E-Book
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