Wikimedi'Òc

Bulletin of the Geological Society of America (IA bulletinofgeol281917geol).pdf - Fæ

Bulletin of the Geological Society of America (IA bulletinofgeolo331922geol).pdf - Fæ

The Journal of geology (IA journalofgeology101902univ).pdf - Fæ

The Proceedings of the Iowa Academy of Science (IA proceedingsofio131906iowa).pdf - Fæ

Petroleum and natural gas in Oklahoma (IA petroleumnatural00snid).pdf - Fæ

North American index fossils, invertebrates (IA northamericanind02grab).pdf - Fæ

Index to the stratigraphy of North America (IA cu31924004597872).pdf - Fæ