"The average Briton owns more than 50 books, but do they organise them alphabetically, by colour, genre, or size - or simply let chaos reign? Our research shows that many simply prefer to let chaos reign." https://yougov.co.uk/topics/arts/articles-reports/2020/03/05/how-Brits-organise-books
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@estherschindler ^shudder* it has to be by author surname, alphabetically, with series together and in order. (you can tell I worked in a library at school). My reference books are by subject. lol