Black and white lantern slide of a water gauge, or a wooden staff marked with lines emerging from the water of the Yellow River.

Black and white lantern slide of three men in a small boat guaging the canal water level.

Black and white lantern slide of two men with a silt pump. One man holds a bucket under the pump spout.

Black and white lantern slide of six people aboard a small boat, reading the meter of a water gauge in the Yellow River.

Black and white lantern slide of seven people aboard a small boat, reading the meter of a water gauge in the Yellow River.

Black and white lantern slide of two men standing at the bank of the Yellow River near a gauging station.

Black and white lantern slide of a dike on the Yellow River with ropes connected from the dike down into the water.

Black and white lantern slide of crowds of people along a dike of the Yellow River in China.

Black and white lantern slide of a dike on the Yellow River being closed.

Black and white lantern slide of neat piles of stones collected as dike building materials.

Black and white lantern slide of a stone dike along the Yellow River in China. A small boat sits on the water near the dike.

Black and white lantern slide of a masonry dike along the Yellow River in China at high water.