DATAH presently contains 82 collections, consisting of 83 378 images.
A large part of DATAH is available on the website of the Endangered Archives Program of the British Library:
EAP 314: 10 collections, 652 documents, 3 460 images
http://eap.bl.uk/database/overview_project.a4d?projID=EAP314
EAP 458: 36 collections, 3 039 documents, 36 774 images
https://eap.bl.uk/project/EAP458
EAP 689: 36 collections, 1623 documents, 43 144 images