SCHUMACHER an GAUSS, 16. Mai 1843 - Desgl.
Varia. Atlas des Erdmagnetismus Bd. 12, GDML_Books, (1929), p. 291 / Harvested from
Access to full text 
@article{PPN236060120+dmdlog182,
     title = {SCHUMACHER an GAUSS, 16. Mai 1843  -  Desgl.},
     booktitle = {Varia. Atlas des Erdmagnetismus Bd. 12},
     series = {GDML\_Books},
     year = {1929},
     pages = {291},
     url = {http://dml.mathdoc.fr/item/PPN236060120+dmdlog182}
}

 (éd.). SCHUMACHER an GAUSS, 16. Mai 1843  -  Desgl., dans Varia. Atlas des Erdmagnetismus Bd. 12, GDML_Books,  (1929), p. 291. http://gdmltest.u-ga.fr/item/PPN236060120+dmdlog182/