The drawings purchased from Nelly van Moorsel were initially given the code 'DOES' with a number 1 increasing to 47. The works that the NAI received on loan from the ICN retained their ICN number (beginning with AB) and were given the code 'DOEX'. Eventually everything was converted to DOES, whereby the works purchased from Nelly can be identified by a combination of DOES and a number and the works from the ICN by the combination DOES with an AB numberThe objects were described individually, after which the information was entered into a database created especially for this collection.