Flora of Illinois, containing keys for the identification of the flowering plants and ferns, by George Neville Jones ...

no.2

A manual of the mosses of western Pennsylvania and adjacent regions.

no.6

Woody plants of the western national parks; containing keys for the identification of trees and shrubs, by Virginia Long Bailey and Harold Edwards Bailey.

no.4

The mosquitoes of the southern United States east of Oklahoma and Texas, by Stanley J. Carpenter ... Woodrow W. Middlekauff ... and Roy W. Chamberlain ...

no.3