There's a lengthy oral history, a series of interviews with him, on the American Institute of Physics website [1]. They're constantly talking about his noteboo

There's a lengthy oral history, a series of interviews with him, on the American Institute of Physics website [1]. They're constantly talking about his notebooks and how he can go back to look things up in them. [1] https://www.aip.org/history-programs/niels-bohr-library/oral-histories/5020-5 https://www.aip.org/history-programs/niels-bohr-library/oral... (link to fifth session)