Catalog of hymenoptera in America north of Mexico / prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein ... [et al.].

vol. 1

Flora boreali-americana, sistens caracteres plantarum quas in America septentrionali collegit et detexit Andreas Michaux.

1

Catalog of hymenoptera in America north of Mexico / prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein ... [et al.].

vol. 3

Catalog of hymenoptera in America north of Mexico / prepared cooperatively by specialists on the various groups of Hymenoptera under the direction of Karl V. Krombein ... [et al.].

vol. 2