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.

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.

An unidentified man on horseback leading a pack train through the Hozameen Mountains on the 1920 Canada trip.

Several loaded pack horses grazing in a meadow by a stream in the Hozameen Mountains on the 1920 Canada trip.

An unidentified man on horseback leading a pack train through the Hozameen Mountains on the 1920 Canada trip.

An unidentified man on horseback leading a pack train through the Hozameen Mountains on the 1920 Canada trip.

A photograph of Ervin Flowers standing between two horses in front of a barn at the Flowers family farm near Mt. Scott in Southeast Portland. A handwritten note on the back of the photograph reads, "Ervin Flowers on Farm."

Photograph showing a wheat harvest underway in a field near Madras, Oregon. Farm workers pose on several machines used to cut and harvest wheat. The machine on the right is pulled by over a dozen horses. Handwritten label at the bottom of the print reads, "Harvesting wheat near Madras. Crook to Oregon. T.A. Taylor, A.D. Anderson, Combine Harvesters. Copyright O. Hedlund #1019."

Photograph showing a harvest underway in an agricultural field. Farm workers pose on horse-drawn wagons that sit next to stacks of crops. Horses power a header, left of center. Handwritten note on the back of the print reads, "Heading outfit of Joe Klocker, Goldendale, Wn."

Photograph showing a harvest underway in an agricultural field. Farm workers pose on a line of machines and horse-drawn wagons used to harvest crops. At the front of the line, on the left, horses power a header. Handwritten note on the back of the print reads, "Header on farm of Mr. Elsworth, Goldendale, Wn."

Photograph showing a farm scene in an agricultural field. Several farm workers operate various machines and horse-drawn wagons in the field. The machine on the left appears to be a thresher. Desert landscape is visible in the background. Faded signature on the bottom right of the print reads, "Gifford."

Photograph showing approximately a dozen horses pulling farm machinery in an agricultural field. Several farm workers sit on the machine. Handwritten note on the back of the print reads, "Culver, Ore."

Photograph showing approximately a dozen horses pulling a combine through an agricultural field in Goldendale, Washington. Several farm workers are on the combine. Handwritten note on the back of the print reads, "Combined harvester on farm of John S. Elshings(?), Goldendale, Wn." Second handwritten note reads, "Klickitat Co."

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.

Several pack horses tied to a fence at Wentworth Ranch on the 1920 Canada trip. A cabin is visible in the distance. 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.

An unidentified man and several horses in a ravine on the 1920 Canada trip. Location unknown, but likely somewhere along the U.S.-Canadian border at British Columbia.