Bibliography.

Gleanings in Bee Culture.

The American Bee Journal.

The Beekeepers' Review.

The ABC and XYZ of Bee Culture.

Phillip's Beekeeping.

Hutchinson's Advanced Beekeeping.

Gray's Field, Forest, and Garden Botany.

Wisconsin Bulletin #233.

U.S. Dept. Bulletin #289.

Reconnoissance Soil Surveys of Wisconsin.

Reports of the U.S. Weather Bureau.