Plan and section of St. Anthony Falls in Survey of Upper Mississippi River (page 29).

Plan and section of St. Anthony Falls

Plan and section of St. Anthony Falls in Survey of Upper Mississippi River (page 29).

Black and white photograph of Major General Gouverneur K. Warren, ca. 1863–1865. Photographed by Matthew Brady.

Gouverneur K. Warren

Major General Gouverneur K. Warren, ca. 1863–1865. Photographed by Matthew Brady.

Black and white photograph of Major General Gouverneur Kemble Warren, United States Army, ca. 1863.

Major General Gouverneur Kemble Warren

Major General Gouverneur Kemble Warren, United States Army, ca. 1863.

Warren, Gouverneur Kemble (1830–1883)

Gouverneur Kemble Warren, topographer, Civil War veteran, and accomplished engineer, served his entire career with the U.S. Army. During his service, he mapped the tributaries of the Mississippi River and transcontinental railroad routes. As the first district engineer in St. Paul, he worked to preserve St. Anthony Falls and designed the nation’s first reservoir system. Glacial River Warren, which carved the Pleistocene channel now followed by the Minnesota River, is named for him.

Color image of a Soybean aphid on a soybean leaf with pointy trichomes, 2009. Photographed by Claudio Gratton, University of Wisconsin.

Soybean aphid

Soybean aphid on a soybean leaf with pointy trichomes, 2009. Photographed by Claudio Gratton, University of Wisconsin.

Color image of a corn root worm inside the tassel of a corn plant. U.S. Department of Agriculture, 2003.

Western corn rootworm

A corn root worm inside the tassel of a corn plant. U.S. Department of Agriculture, 2003.

Diagram of a grasshopper hatching. Published in University of Minnesota Extension Bulletin 194, revised June 1940.

Diagram of grasshopper hatching

Diagram of a grasshopper hatching. Published in University of Minnesota Extension Bulletin 194, revised June 1940.

Black and white photograph of highway trucks delivering grasshopper poison to farmers, 1938.

Highway trucks delivering grasshopper poison

Highway trucks delivering grasshopper poison to farmers, 1938.

Black and white photograph of WPA crew mixing grasshopper bait for distribution to farmers, State Highway Maintenance Shops at Hopkins, 1937.

WPA crew mixing grasshopper bait

WPA crew mixes grasshopper bait for distribution to farmers, State Highway Maintenance Shops at Hopkins, 1937.

Black and white photograph of WPA workers with grasshopper bait for distribution to farmers, 1937.

WPA workers with grasshopper bait

WPA workers with grasshopper bait for distribution to farmers, 1937.

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