The North American arithmetic.

Mode of access: Internet.

Key to North American birds.

Mode of access: Internet.

A selected bibliography of North American forestry /

Includes index.

Illustrations of North American grasses

Mode of access: Internet.

Bark structure of North American conifers /

Literature cited: p. 84-85.

The North American subspecies of Culicoides variipennis (Diptera, heleidae) /

References: p. 34-35.

An annotated list of the important North American forest insects /

Caption title.

Food plants of the North American Indians /

Includes index.

A revision of the North American aphids of the genus Myzus /

Copy 2: Amer. Ent. Soc. QL523.A6M3.

A revision of the North American species of buprestid beetles belonging to the tribe Chrysobothrini ...

Contribution from Bureau of entomology and plant quarantine.

New species of North American bees of the genus Dufourea (Hymenoptera, Halictidae) with descriptions of two previously undescribed females /

Cover title.

The strength of North American woods /

Chiefly tables.

Biosystematics of the first-stage larvae of some North American Bruchidae (Coleoptera) /

Includes appendix.

The North American species of Forcipomyia, subgenus Euprojoannisia (Diptera: ceratopogonidae) /

Issued Dec. 1978.

The North American species of whiteflies of the genus Trialeurodes /

Includes indexes.