Photograph showing a caterpillar machine at the top of a canyon, with a man driving in an open cockpit. Next to the machine is a man standing to the side of the dirt track, and a car with an open door can be seen in the background.

Photograph showing a man driving a open cockpit caterpillar machine at the top of a canyon at Cove Palisades State Park. At the base of the canyon is a river (the Deschutes River or Crooked River). On the machine is written "Caterpillar."

Negative of a photographic postcard showing the generators at the Bonneville Dam. The generators are circular machines lined up in a large open room. Handwriting on negative reads, "Generators - Bonneville Dam. Christian 11-623."

Photograph showing a man (Alex Komolofske) wearing a dirtied work jumper standing next to a wheeled generator vehicle. A "PGE" logo is attached to the generator, with "Onan Electric Plant" painted on the side.

Photograph showing a man wearing a long jacket standing on a raised cement platform. He is looking towards three large electrical units with belts, and water can be seen under the platform. In the background is a wooded hillside. Written on the negative is "51-868."

Photograph showing a man looking at an accounting machine, with the mechanism covers removed. Multiple conduits and a fan can be seen. A bar runs across the bottom of the frame, blocking some of the image.

Photograph showing five women sitting at individual card punch accounting machines. Each person has a pad holder to her left, and a visible punch card in the machine. Hanging coats can be seen in the background, as well as two large windows.

Photograph taken from a high angle, looking downward at a kneeling man working on a large electrical generator at an unidentified location. Another unit can be seen in the background. Written on the negative is "51-880."

Photograph showing workers in an open area using a truck mounted "Williams Hole Digger." The man on the right is facing towards the machine and is leaning towards the hole, while the other man stands to the left also looking towards the hole. Written on the negative is "50-411."

Photograph of a man sitting in front of a switchboard unit. Two meters on the unit are visible, with "watts" and "volts." The is turning a numbered dial with his right arm while facing away from the camera. Written on the negative is "50-376."

Photograph showing two men feeding branches into a wood chipper. Wood chips can be seen coming out from the side of the unit. Written on the negative is "50-439."

Photograph showing a man using a industrial monkey while trimming a tree away from electrical lines. He is holding the handle of a wired tool while looking downward at the tree. Written on the negative is "50-480."

Photographs showing two men in suits standing to either side of a large radio transmitter unit. They are both looking at the unit, and the man on the right is smiling. A sign on the unit reads "Wired Radio Transmitter, Line Material Co." Written on the negative is "50-658."

Photograph showing a man facing towards a large electrical generator at the Oak Grove Dam. On his right is a stairway leading to the upper level of the generator, which is in a large industrial powerhouse building. Written on the negative is "49-291."

Photograph showing workers building a transmission tower component. Several men holds parts of the structure, while one man on the left side of the frame looks on. In the distance, fences, an open field, and wooden houses can be seen. On the negative is written "49-74."

Photograph taken from a side angle, showing an electrical transformer, likely at an electrical substation. Several ceramic insulators can be seen at the top of the unit, as well as numerous attached electric lines. On the negative is written "49-73."

Photograph showing an electrical transformer, likely at an electrical substation. On the front of the unit is written "General Electric." On the top of the unit are several ceramic insulators and electric lines. On the negative is written "49-77."

Photograph, taken from the side, showing a man looking upward while holding a metal lever. In the background, more electrical equipment and ceramic insulators can be seen. On the negative is written "49-86."

Photograph showing people and cars in front of a fenced substation. Multiple men in suits and hats stand on the sidewalk in front of the metal fence, behind which several large pieces of electrical equipment can be seen. On the negative is written "49-102."

Photograph showing a man with a paneled electrical unit. He is wearing a pocketed work vest, and is looking at the panel while holding a wire towards the board. On the negative is written "49-95."

Photograph showing a transformer at the Fairmont substation in June of 1949. Above the transformer, numerous ceramic insulators can be seen, as well as a large "PGE" sign. On the negative is written "49-135," which is crossed out and replaced with "49-101."

Photograph showing two men in suits with unidentified machinery. One man looks on as the other uses a metal pole to move a lever. Several numbered signs can be seen on the machinery, which extends into the background along the wall.

Photograph showing the interior of the powerhouse at the Oak Grove Dam on the Clackamas River. Two large electrical units can be seen, with upper walkways. The building is a large industrial space with tall windows. Written on the negative is "49-293."

Photograph showing two suited men sitting at a desk while speaking on telephones. Both men look down towards the desk, which holds pieces of equipment. Behind the individuals are wall mounted electrical units, other pieces of wooden furniture, and a calendar from "Leonard"s Food Center." On the negative is written "49-46."

Photograph showing a man on a ladder wearing a safety belt holding an electrical line with ceramic insulators. Behind him, two other men in work wear stand higher on the metal frame structure. On the negative is written "49-53."

Photograph of a man in a suit with a microphone, standing in front of a wooden utility pole. Attached to the pole is a metal electrical panel with switches. In the background, a vehicle with an open trunk is visible. On the negative is written "49-66."

Photograph showing a paneled electrical unit with numerous switches. Wires can be seen coming out of the bottom of the unit. On the negative is written "49-81."

Photograph showing an unidentified worker using machinery at the Albina Engine & Machine Works shipyard in Portland. He is sitting on a stool next to the machine, facing to the left, and holding an object in place with pliers. The number 240 is written on the negative and is visible in the lower right corner of the image. Information based on the following unverified note written on the negative sleeve: “Albina shipbuilding.”