Many corporations - if not most large research corporations - use electronic notebooks in lieu of paper notebooks now. There are systems, and I know nothing about them, that can be used for legal purposes such as proof of work done on a certain date. There may be commerically available software for this. Properly designed systems have been used in courts - at least in patent litigation, which is the only legal area I know about. **
My company has used them for many years now.
Before those systems, there was a method to add a paper copy to the old bound notebooks (such as spectra, photographs, etc.). The paper was taped or pasted on a page of the bound notebook. A line of text was stamped so that half was on the page of the notebook and half on the paper, with a space for the person to sign and date it - again half on the page and half on the paper. this was used long before computers were common. (Yes, I'm dating myself here). You could probably do this if you want to print out what you typed and tape it into the bound notebook.
** if you really want more information, here is an article about their use in patent litigation.
http://www.mondaq.com/unitedstates/x/126014/