Sowerby, James DeCarle, 1836, Descriptive notes respecting the shells figured in Plates XI – XXIII Appendix A: 335 – 348. ''' In' '' Fitton, W. H. Observations on some of the strata between the Chalk and the Oxford Oolite in the south-east of England

Sowerby, James DeCarle, 1836, Descriptive notes respecting the shells figured in Plates XI – XXIII Appendix A: 335 – 348. ''' In' '' Fitton, W. H. Observations on some of the strata between the Chalk and the Oxford Oolite in the south-east of England, Transactions of the geological society of London, 2 4, pp. 335-348