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Otto Froebel |
X |
WIL /+F2 |
= Saunders No. 11642-11643, 12872-12874 |
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F2 of 11643 |
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= Saunders No.15635-15637 |
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More information on this topic can be found: A.P. Saunders in his notebooks (use the link above) |