@book {Esper1791,
	title = {Die Pflanzenthiere in Abbildungen nach der Natur mit Farben erleuchtet nebst Beschreibungen},
	volume = {1},
	year = {1791},
	pages = {320},
	publisher = {Raspeschen Buchhandlung},
	organization = {Raspeschen Buchhandlung},
	address = {N{\"u}rnberg},
	keywords = {RCBS, TIP},
	url = {http://books.google.com/books?id=ZR8OAAAAQAAJ},
	author = {Esper, E J C}
}
@book {Esper1794,
	title = {Die Pflanzenthiere in Abbildungen nach der Natur mit Farben erleuchtet nebst Beschreibungen},
	volume = {2},
	year = {1794},
	pages = {303},
	publisher = {Raspeschen Buchhandlung},
	organization = {Raspeschen Buchhandlung},
	address = {N{\"u}rnberg},
	keywords = {RCBS, TIP},
	url = {http://books.google.com/books?id=DYdIAAAAYAAJ},
	author = {Esper, E J C}
}
