@article {dall_preliminary_1893,
	title = {Preliminary notice of new species of land-shells from the Galapagos Islands, collected by Dr. G. Baur},
	journal = {The Nautilus},
	volume = {7},
	number = {5},
	year = {1893},
	pages = {52{\textendash}56},
	author = {Dall, William Healey}
}
