Black and white lantern slide of a Paleolithic drawing of a crumpled bison from Altamira.

Black and white lantern slide of a Paleolithic drawing of a crumpled bison from Altamira.

Black and white lantern slide of a Paleolithic drawing of a crumpled bison from Altamira.

Black and white photograph of the interior of a section of the Cuicuilco Pyramid from above. A man holding a sombrero is standing in the center of the image, surrounded by plaster walls.

Black and white photograph of the ruins at the Cumae Acropolis.

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."

Black and white lantern slide of a "deep fireplace" at the Uyak Bay site.

Black and white photograph of a ladder in front of a tree next to a cottage. Part of a camera ladder rig system developed by Merrill for taking overhead photographs of archaeological excavations.

Black and white lantern slide of Paleolithic drawings of bison from Niaux cavern.

Black and white lantern slide of a group of men near the entrance of El Pendo Cave.

Black and white lantern slide of a Paleolithic engraving of a bison from La Greze cave.