Re: Accession # vs. Catalog # Welcome to Connecting to Collections Care › Forums › Group Forums › C2C Community Archives – 2012 through 2014 › Accession # vs. Catalog # › Re: Accession # vs. Catalog # December 19, 2012 at 6:47 pm #133165 Laurie HannahMember Natural history museums often use different kinds of catalog numbers from other museums. You might take a look at this brief intro. from the American Museum of Natural History http://collections.paleo.amnh.org/11/cataloging.