- Cărți electroniceCheck-list of the Birds of KansasHarrison Bruce Tordoff
- Cărți electroniceStudies of Birds Killed in Nocturnal MigrationHarrison Bruce Tordoff
- Cărți electroniceCheck-list of the Birds of KansasHarrison Bruce Tordoff
- Cărți electroniceStudies of Birds Killed in Nocturnal MigrationHarrison Bruce Tordoff