@book {7213,
	title = {Report on the geology of the county of Londonderry, and of parts of Tyrone and Fermanagh},
	year = {1843},
	note = {xerox784 p. illus., col. map., plates (part col., part fold.) 24 cm.Have 126-127 (index and description), plt.25, 754-755 (formation index), xxviii-xxix (plate legend)},
	pages = {784},
	publisher = {A. Milliken, Hodges and Smith, Longman, Brown, Green, and Longmans},
	organization = {A. Milliken, Hodges and Smith, Longman, Brown, Green, and Longmans},
	address = {Dublin \& London},
	keywords = {avicula, bakevellidae, biogeography, bivalvia, fossils, gervillia, mollusca, paleontology, Pteria, pteriidae, pterioida, pterioidea, rhaetavicula, taxonomy},
	author = {Portlock, J. E.}
}
@book {1448,
	title = {Historia f{\'\i}sica pol{\'\i}tica y natural de la Isla de Cuba por D. Ram{\'o}n de la Sagra},
	volume = {Tomo 5, Mo},
	year = {1843},
	publisher = {Arthus Bertrand},
	organization = {Arthus Bertrand},
	address = {Paris},
	keywords = {avicula, aviculidae, bivalvia, isognomon, isognomonidae, malleidae, malleus, malleus candeanus, mollusca, perna, Pteria, pteriidae, pterioida, pterioidea, taxonomy},
	author = {Orbigny, A. D. d{\textquoteright}}
}
@book {1492,
	title = {Report on the geology of the county of Londonderry, and of parts of Tyrone and Fermanagh},
	year = {1843},
	note = {784 p. illus., col. map., plates (part col., part fold.) 24 cm.Have 126-127 (index and description), plt.25, 754-755 (formation index), xxviii-xxix (plate legend)},
	pages = {784},
	publisher = {A. Milliken, Hodges and Smith, Longman, Brown, Green, and Longmans},
	organization = {A. Milliken, Hodges and Smith, Longman, Brown, Green, and Longmans},
	address = {Dublin \& London},
	keywords = {avicula, bakevellidae, biogeography, bivalvia, fossils, gervillia, mollusca, paleontology, Pteria, pteriidae, pterioida, pterioidea, rhaetavicula, taxonomy},
	author = {Portlock, J. E.}
}
