This list contains ''Resource Description and Access'' (RDA) terms and corresponding two-character lower case alphabetic codes for RDA Carrier types. These types can be recorded in MARC MARC12/UNIMARC Bibliographic and Holdings records in textual form and/or in the two-character coded form in '''MARC MARC21 field''' '''338 (Carrier Type)'''. They may also be recorded, sometimes in a more granular and sometimes in a more general form, with one-character codes in the '''MARC MARC21 007/01 (Specific material designation)''' with a few exceptions (see tables). In the following, the two-character codes and terms for field MARC21 338 $b and $a, respectively, are listed along with the corresponding MARC MAR21C 007 (or other) codes.