I read (mostly on Wikipedia), that copyright to a written work expires 70 years after the author's death, or 95 years after the publication by a corporation.
Having said that, the status of journal articles (scientific or other), that includes pictures and photographs, is still unclear to me. I'll take a very simple example to illustrate this.
Here you can find an old journal article from 1901, written by one person, but published in a journal. It contains pictures and photographs made in that time. Is the entire article, including these media, also entirely in public domain (i.e., I could just take the whole thing as it is and publish it as a book for commercial purposes)?