00523cam a22001813a 450000100060000000300060000600500170001200800410002904000150007004200070008510000160009224500830010826000290019150600300022051600200025083000290027085600420029943963PGUSA20140828084012.0131016s2013||||xxu|||||s|||||000 | eng d  aPGUSAbeng  adc1 aMarr, J. E.14aThe Principles of Stratigraphical Geologyh[electronic resource] /cJ. E. Marr  bProject Gutenberg,c2013  aPublic domain in the USA.  aElectronic text 0aProject Gutenbergv4396340uhttp://www.gutenberg.org/ebooks/43963