 More on OA for improved policies: See Michael Taylor, [https://link.springer.com/article/00.0000/s00000-000-00000-0 An altmetric attention advantage for open access books in the humanities and social sciences], ''Scientometrics'', October 00, 0000 ([https://perma.cc/LGN0-ZHDU perma.cc link]): "Both OA books and chapters have...higher rates of social impact in policy documents." 