After the work of Kozicic Glagolitic printing house (1530-1531), printing work in Rijeka was restored in the late 18th century, by the Karletzky printing house. In more than one hundred years of work (and for some period that was the only printing house in Rijeka) it printed a great number of different types of publications in several languages written with the Latin alphabet. Publications written in Croatian language are valuable materials for the research of different areas of Croatian history and Rijeka's local history, and they are particularly important for the research of the history of the Croatian language and the standardization processes that took place from the end of the 18th to the late 19th century. Therefore, the introductory part of the thesis deals with the principal issues of Croatian literary and linguistic history from the end of the 18th to the end of the 19th century. It also brings the aims of the thesis and defines the methodology. The first part of the thesis brings a survey of development and work of printing house Karletzky in the context of development of Rijeka's printing work and publishing trade. It also brings sociopolitical and cultural context of its appearance and work. The thesis shows the Karletzky multilingual printing work, but publications written in Croatian language are of special interest. The main part of the thesis brings the linguistic analysis of these publications with special emphasis on orthographic features and selected phonological, morphological and syntactic features of the Croatian language. On the basis of the linguistic analysis of the publications written in Croatian language and printed in the Karletzky printing house, data which complete the picture of literary and linguistic issues and standardization processes in Croatian history from the end of the18th to the end of the 19th century are determined. The conducted analysis also confirms that, regardless of sociopolitical and administrative conditions, spiritual and cultural unity of the Croatian linguistic area based on the Croatian language was unquestionable.