@misc{Bertrand_Alexandre_(1795-1831‏)_Lettres,
 author={Bertrand, Alexandre (1795-1831‏)},
 howpublished={online},
 publisher={Tessier},
 language={fre},
 type={monografie},
 title={Lettres sur les révolutions du globe},
 keywords={paleontologia, geologia},
}