Black and white photograph of steamships passing thorugh the Gatun Dam locks in Panama. Several people are standing along the edge of the lock to watch the ships pass. "Gatun Locks." is written on the bottom of the image.

Black and white photograph of a pier surrounded by ships. A rowboat is visible floating closer to the photographer. Photograph was taken by Robert Merrill in the Chinese coastal resort area of Beidaihe Qu.

Black and white lantern slide of several people standing on a boat in the canal near water guages while another group of people stand nearby on the bank looking on.

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 a metal rain gauge instrument.

Black and white lantern slide of a group of men, standing near a metal rain gauge inside a small open-sided square structure.

Black and white photograph of an Italian city street, the Genoa Vico delle Marinelle. The street is narrow with streetlamps attached to the sides of buildings. A person is seen walking in the distance.

Black and white lantern slide copy of a sketch map showing Lake Tonawanda and spillways from it to glacial Lake Iroquois, with surrounding text from an unidentified publication.

Black and white lantern slide copy of a sketch map of the vicinity of Lake Ontario showing physiographic divisions, with surrounding text from an unidentified publication.

Black and white lantern slide copy of a sketch map showing moraines around the west end of Lake Ontario, with surrounding text from an unidentified publication.

Black and white lantern slide copy of a geological map of Yellowstone National Park and Yellowstone Forest Reserve from an unknow source.

Black and white photograph of three geologists, Dr. Frank Leverett, Dr. Douglas W. Johnson, and Wright, on the beach near Tampa, Florida.