Do you fancy a PDF copy of the below papers? (just go to
http://www2.nrm.se/ve/birds/sape/litt001.html.en and put in the
field find eggs and you will find lots of publications...below some
examples)

Bibi, F., Shabel, A., Kraatz, B. & Stidham, T. 2006. New fossil
ratite (Aves: Palaeognathae) eggshell discoveries from the Late
Miocene Baynunah Formation of the United Arab Emirates, Arabian
Peninsula. Palaeontologia Electronica Vol 9, Issue 1; 2A, 13 p. PDF
http://www.paleo.erdw.ethz.ch/2006_1/eggshell/eggs.pdf

Bajpai, S., Sahni, A. & Srinivasan, S. 1993. Ornithoid eggshells
from Deccan intertrappean beds near Anjar (Kachchh) western India.
Current Science (Bangalore) 64(1):42-45. HTML
http://www.ias.ac.in/j_archive/currsci/64/1/42-45/viewpage.html

Allen, J, A. 1899. Abstract from Farrington O. C. A fossil Egg from
South Dakotas in Field Columb. Mus. 1899. 191. Auk 16:370. DejaVu
PDF
http://elibrary.unm.edu/sora/Auk/v016n04/p0370-p0370.pdf

Bird, M. I., Turney, C. S. M., Fifield, L. K., Smith, M. A., Miller,
G. H., Roberts, R. G. & Magee 2003. Radiocarbon dating of organic-
and carbonate-carbon in Genyornis and Dromaius eggshell using
stepped combustion and stepped acidification. Quaternary Science
Reviews 22:1805-1811. PDF
http://uow.edu.au/science/eesc/staff/cturney/docs/4Eggshells.pdf

Bradbury, W. C. 1919. Some notes on the egg of Aepyornis maximus.
Condor 21:97-101. DejaVu PDF
http://elibrary.unm.edu/sora/Condor/files/issues/v021n03/p0097-
p0101.pdf

Chandler, R. M. & Wall, P. 2002. The first record of bird eggs from
the early Oligocene (Orellan) of North America. Proceedings of the
6th Fossil Resource Conference. Geologic Resource Division Technical
Report NPS/NRGRD/GRDTR-01. HTML
http://www2.nature.nps.gov/geology/paleontology/pub/fossil_conference
_6/chandler.htm

Clarke, S. J. 2005. Isoleucine epimerisation and stable isotope
ratio studies of cassowary, megapode and aepyornis eggshells:
biogeochemical and palaeonenvironmental implications. PhD Thesis,
University of Wollongong. PDF
http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050405.124008/


Gill, B. J. 2000. Morphometrics of moa eggshell fragments (Aves:
Dinornithiformes) from Late Holocene dune-sands of the Karikari
Peninsula, New Zealand. Journal of the Royal Society of New Zealand
30(2):131-145. PDF
http://www.rsnz.org/publish/jrsnz/2000/7.pdf


Grellet-Tinner, G. & Dyke, G. J. 2005. The eggshell of the Eocene
bird Lithornis. Acta Palaeontologica Polonica 50(4):831-835. PDF
http://app.pan.pl/acta50/app50-831.pdf