SCP Foundation Members Tees, Class Obejct : EUCLID Art Board Print for Sale by Yu-u-Ta

SCP Foundation Notebook – Sofia Zakia

SCP Foundation Classes by CalicoStonewolf on DeviantArt

For all personnel confused by the new Anomaly Classification System, I've made an at-a-glance poster for your office/room (higher resolution versions available on request). : r/SCP

SCP's classes, SCP_GaM Wiki

D-class personnel, SCP Foundation Wikia

Anomaly Classification Bar for ACS - SCP Foundation

Keter Classification SCP Foundation Secure Contain' Women's Pique Polo Shirt

Keter Classification SCP Foundation Secure Contain Protect Onesie by Nehan Kiaraa - Fine Art America

SCP FOUNDATION: Entity Classification Logbook: Log, classify and describe new SCP Foundation entities in this logbook - 6x9 inches - 120 pages

Explaining the Containment classes and secondary class of the SCP