- EbookEurypterids of the Devonian Holland Quarry Shale of OhioErik Norman Kjellesvig-Waering
- EbookPennsylvanian invertebrates of the Mazon Creek Area, IllinoisErik Norman Kjellesvig-Waering
- EbookPennsylvanian invertebrates of the Mazon Creek Area, IllinoisErik Norman Kjellesvig-Waering
- EbookEurypterids of the Devonian Holland Quarry Shale of OhioErik Norman Kjellesvig-Waering