Traditionally, information in Russian textbooks on history, geography is given in "paragraphs". But this word in Russian has the meaning different from that in English - in fact, those paragraphs are chapters. Is it possible to use the word "paragraph" speaking of the structure of textbooks? I personally would use the word "chapter".
The English word for Russian "параграф" is section. So I think it would be appropriate to say that in textbooks the information is given in sections, or that the texts in the textbooks are divided in sections. I would not use here the noun 'chapter', which is translated into Russian as "глава". To my mind, that term mainly refers to belles-lettres.