Natural History of the Long Expedition to the Rocky Mountains (1819-1820) Evans Howard Ensign Heftet / 1997 / Engelsk
Taxonomic Study of the Nearctic Spider Wasps Belonging to the Tribe Pompilini (Hymenoptera: Pompilidae), Vol. 1 (Classic Reprint) Evans Howard Ensign Heftet / 2018 / Engelsk
Taxonomic Study of the Nearctic Spider Wasps Belonging to the Tribe Pompilini (Hymenoptera: Pompilidae), Vol. 1 (Classic Reprint) Evans Howard Ensign Innbundet / 2018 / Engelsk
Natural History of the Long Expedition to the Rocky Mountains (1819-1820) Evans Howard Ensign Innbundet / 1997 / Engelsk
