CD-ROM - computer compact-disks

• CD-ROM "The World of Beetles" ("Wir bestimmen Kaefer")
• CD-ROM "Beetle Larvae of the World"
• CD-ROM "The Beetles of the World"
• CD-ROM "Nut weevils of the subfamily Cryptorhynchinae of Canary Islands"
• CD-ROM "Long-horned beetles (Cerabmbycidae) of Italy"
• CD-ROM "Leaf beetles of the genus Cryptocephalus (Chrysomelidae) of the Palearctic