The second edition of the classification will be complete in twenty-three volumes. Fourteen have been published so far, shown by dates of publication in the following list, though volumes marked * are currently out of print. Available volumes may be obtained from the publisher Walter de Gruyter or through any academic book supplier.

Some unpublished draft schedules are also listed below. Some of these have been developed by users - they are not authoritative and may be substantially changed when the definitive version is prepared, but they are made available here for those who may find them useful in the meantime. There are conflicts in notation in some of these drafts, especially in class Z, and these have yet to be resolved. Comments and suggestions are welcome and will be taken into account in future development.