Department of Public Works employee entering a gas-filled manhole wearing a gas mask, [s.d.]

Photograph of a Department of Public Works employee entering a gas-filled manhole wearing a gas mask, [s.d.]. At center, the worker is pictured wearing a hat over the mask, peering just above the open manhole. Behind him, the feet of a second worker can be seen, along with hands that are feeding an air line to the mask. More feet are visible to the left and right. In the foreground, an electric drill "run from portable generator" can be seen.