The book is aimed at both philatelic enthusiasts and trilobite collectors. It provides a detailed presentation of all stamps, postmarks, and postal stationery that are currently known. Additionally, a brief description of the appearance, size, and distribution, along with a photograph of the depicted trilobite, is included to explain the philatelic material. Our goal was to document the same species photographically whenever possible; if that was not feasible, we aimed to document a closely related species of the same genus.