There are 27 datasets of digitised AAS card catalogues from microfilm. Some of the cards were transcribed and matched by volunteers as part of the British Library’s LibCrowds platform, in a project called ‘Convert-a-Card’. The platform is no longer operational, but a UK Web Archive snapshot of ‘Convert-a-Card’ is available here: http://www.libcrowds.com/archived/20221208133408/https://www.libcrowds.com/collection/convertacard.