MAETLAND GEOLOGICAL SURVEY 39 



1807. 



Scott, Joseph. A Geographical description of the states of Mary- 

 land and Delaware. Phila., Kimber, Conrad & Co., 1807. 



1809. 

 Maclure, Wm. Observations on the Geologj' of the United States, 

 explanatory of a Geological Map. (Bead Jan. 20, 1809.) 

 Trans. Amer. Phil. Soc, o. s. vol. vi, 1809, pp. 411-428. 



Macluke, Wm. Observations snr la Geologie des Etats-Unis, snr- 

 vant a espliquer une Carte Geologique. 



Journ. de phys., de chim. et d'hist. nat., tome Ixix, 1809, pp. 204-213. 



1811. 

 Maclube, Wm. Suite des observations snr la Geologie des Etats- 

 TJnis. 



Journ. de phys., de chim. et d'hist. nat., tome Ixxii, 1811, pp. 137-165. 



1817. 

 Macluee, Wm. Observations on the Geology of the United States 

 of America, with some remarks on the effect produced on the nature 

 and fertility of soils by the decomposition of the different classes of 

 rocks. With two plates. 12mo. Phila., 1817. 



1818. 



Maclure, Wm. Observations on the Geology of the United States 

 of America, with some remarks on the probable effect that may be pro- 

 duced by the decomposition of the different classes of Kocks on the 

 nature and fertility of Soils. Two plates. 



Republished in Trans. Amer. Phil. Soc, vol. i, n. s., 1818, pp. 1-91. 



Leon. Zeit., i, 1826, pp. 124-138. 



1820. 

 Hatden, H. H. Geological Essays; or an Inquiry into some of the 

 Geological •Phenomena to be found in various parts of America and 

 elsewhere. 8vo. pp. 412. Baltimore, 1830. 



1833. 

 Cleayelaxd, Parker. An elementary treatise on ^Mineralogy and 

 Geolog}-. 6 plates. 2d Edit, in 3 vols. Boston, 1822. 



