Photographic postcard showing roughly 30 horses pulling a combine harvester down a hill in a grain field in Washtucna, Washington. Several farm workers pose on the farm machinery. Handwritten label on the front of the postcard reads, "Colliers Combine Harvester, Washtucna. Ash." Handwritten note on the back of the postcard is crossed out. It reads, "Combine at work, H. Collier Ranch, Washtucna."

Photograph showing a farm worker operating a machine to cut crops in a field in Central Oregon. Several horses are used to operate the machinery. Two horse-drawn wagons to the right of the machine are used to harvest the crop.

Photograph showing over 20 horses pulling a combine through an agricultural field. A group of men, women and children pose on the combine. Handwritten note on the bottom of the print reads, "Combine of ?. 3 miles west of Berge(?)."

Photographic postcard showing several men and horses on a beach, likely on the Columbia River. The horses are outfitted to haul material out of the water. The men appear to be seine fishing.

An unidentified man on horseback leading a pack train around Reflection Lake. Phoebe Katherine Finley, William Finley, Jr. and Pete the dog follow behind on foot.

Two unidentified men helping a loaded pack horse stuck on its side in a muddy stream on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Two unidentified men loading a pack horse in the Mill Creek Camp on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Several unidentified men loading pack horses at Wentworth Ranch on the 1920 Canada trip. A cabin is visible to the left. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Several unidentified men and pack horses beside the shore near Pass Creek. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Photographic postcard showing 2 men using a horse-drawn machine to harvest crops in a field near Hillsboro, Oregon. On the right, one man sits on the machine. The other stands in the middle of the field and points toward the machine. Handwritten label on the bottom of the print reads, "Fork Branch Farm, Hillsboro, Or."

Photograph showing a view of a farm surrounded by a desert landscape in Central Oregon. Large agricultural fields stretch out behind a farmhouse in the foreground. A harvest is underway in the fields. Two people ride horses on a dirt road in the foreground. Taken from a nearby hillside.

Photograph of agricultural laborers harvesting wheat in a field. A set of railroad tracks run beside the field on the right side of the photograph. Horses pull several types of agricultural equipment.

Photographic postcard showing a group of 8 people posing as they work in an agricultural field. The group consists of men, women and children. Several horses pull various pieces of farming machinery and a wagon filled with crops.

Photograph showing several farm workers and horse-drawn wagons harvesting crops in an agricultural field in Central Oregon. On the left, a machine cuts the crops in the field.

Photograph showing approximately a dozen horses pulling a combine through an agricultural field near Culver, Oregon. Four farm workers sit on the combine. Handwritten label on the bottom of the print reads, "Combine harvester near Culver, Crook Co., Ore." Today, Culver is in Jefferson County, Oregon.

Photograph of an automobile passing a horse-drawn covered wagon on a dirt road. A man wearing a coat and hat stands in front of the wagon holding a camera in his hand.

Pack horses resting in a field near Mowich camp the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Pack horses and unidentified men resting in a field near Mowich camp the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Pack horses and unidentified men resting in a field near Mowich camp the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Two unidentified men helping a loaded pack horse stuck on its side in a muddy stream on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Unidentified men standing beside bags and crates to be loaded on pack horses on the 1920 Canada trip. A cabin is visible in the background. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Unidentified men standing beside bags and crates to be loaded on pack horses on the 1920 Canada trip. A cabin is visible in the background. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Unidentified men standing in front of Boundary Ranger Station with several pack horses and a dog on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Five unidentified men standing on on the porch of Boundary Ranger Station on the 1920 Canada trip. A dog, pack horses and crates of supplies are visible around the building. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Several unidentified men loading pack horses at Wentworth Ranch on the 1920 Canada trip. A cabin is visible in the background. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Several unidentified men and pack horses beside the shore near Pass Creek. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Three unidentified men loading pack horses on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.

Two unidentified men loading pack horses on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.