In 1964, he joined Reub Long to write The Oregon Desert, which is still a very popular book fifty years after its original publication.

He then served briefly as an Agricultural Extension Agent in Blaine County, Montana, before entering the United States Army in the fall of 1917.

In this capacity, he was responsible for advising local farmers and ranchers on modern agricultural techniques, land use, and recommended conservation practices.

He also played a leading role in creating the Oregon Wheat League, which was subsequently copied across the United States.

In 1964, he joined Reub Long to write The Oregon Desert, which remains an extremely popular work over forty years after it original publication.

The book highlights Eastern Oregon history, high desert geology, rural culture, and native folklore.

First, he worked with Charles Simpson to produce Blazing Forest Trails, then Jackman joined John Scharff to write Steens Mountain in Oregon's High Desert Country.

Jackman Internship Support Program, which provides financial assistance to undergraduate students enrolled in the university's College of Agricultural Sciences.

It also includes a number of photographs of Reub Long, his Fort Rock ranch, and his collection of Native American artifacts.

[8] Summaries of Jackman's papers and photograph collection are available on-line through the Oregon State University library archives and records management program.