Matchbook cover collectors, often referred to as "phillumenists," took great interest in collecting "girlies," which are matchbook covers featuring girls - either nude or scantily clad. Some were actual photos, but most were illustrations by artists at the various match companies. These collectors meticulously organized their "girlie" collections by number, creating detailed lists that documented each unique cover. Each matchbook cover was assigned a specific number based on its design, manufacturer, and distribution details. Enthusiasts maintained comprehensive catalogs and checklists, ensuring they could track their collections and identify missing pieces. As new "girlie" matchbook covers were discovered, these lists were continually updated, reflecting the ongoing passion and dedication within the collector community to preserve and expand their collections of these nostalgic and iconic pieces of advertising art.