Black and white lantern slide of soil layers with measuring device.

Black and white lantern slide of an excavated burial site with a human skeleton. Three archaeologists stand at the edge of the pit, looking down at the remains.

Black and white lantern slide close-up view of a human skeleton excavated from a burial site.

Black and white lantern slide of an excavated burial site with exposed human skeleton under an elderberry tree.

Black and white photograph (damaged negative) of mastodon bones in an excavation site.

Black and white photograph of a field in front of a dirt area next to a forest.

Black and white photograph of a field in front of a dirt area next to a forest.

Black and white photograph of three men carrying a cast of a mastodon bone out of an archaeological site of mastodon bones.

Black and white photograph of a work site in Collingwood, Ontario. Ships are visible in the background.

Black and white photograph of culvert #101, New York State Canal System. Taken by Robert Merrill from north.

Black and white lantern slide of an excavated gravesite. The label on the slide reads, "Interm. Skeleton under slabs."

Black and white lantern slide of an excavated burial site. The lantern is labeled "Deep skeleton, uppermost section."