51
Scientific American
| Project Gutenberg |
2012
E-Book
52
Scientific American
| Project Gutenberg |
2012
E-Book
53
Scientific American
| Project Gutenberg |
2012
E-Book
54
Scientific American
| Project Gutenberg |
2012
E-Book
55
Phillips, Ulrich Bonnell
| Project Gutenberg |
2012
E-Book
56
57
58
59
Burr, Agnes Rush
| Project Gutenberg |
2012
E-Book
60
Yarrow, H.C.
| Project Gutenberg |
2012
E-Book
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- Project Gutenberg (126+)
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- Cambridge Univ. (4+)
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