If you start at this page eap.bl.uk/project/EAP261/search you can scroll through all the scanned titles. I've gone through most already. There are some granthavalis and miscellaneous collections as well as 'unknown' ones too. I imagine there may be some hidden gems in here. I did see 2 or 3 entries for Krishna Kamal Goswami's writings as well. Maybe there's something more here, but I haven't noticed anything yet.