Spokane, Portland and Seattle Railway Engineering Drawing: Tie Plan, Bridge A16.9 (169), west of Holbrook, Oregon, Line Segment 440, Milepost 16.86. Sheet RR - 498, 1960.

Spokane, Portland and Seattle Railway Engineering Drawing: Reinforcement Buttress, Bridge A15.3 (172.1) - Road, west of Holbrook, Oregon, Line Segment 440, Milepost 15.33. Sheet NO - 212, undated.

Spokane, Portland and Seattle Railway Authorization for Expenditure (AFE). President's AFE Number 880. Piping water for sectionman's cottage at Holbrook, Oregon. Chief Engineer/Standard Maintenance Procedure AFE Number CE 942. Correspondence File Number A305-9. Portland Division. Other subject categories: Plumbing Water Pipe.

Spokane, Portland and Seattle Railway Authorization for Expenditure (AFE). President's AFE Number 704. Constructing section foreman's cottage and out buildings at Holbrook, Oregon. Chief Engineer/Standard Maintenance Procedure AFE Number CE 776. Correspondence File Number A305. Portland Division. Other subject categories: Structure Foremans Cottage.

Spokane, Portland and Seattle Railway Authorization for Expenditure (AFE). President's AFE Number 1986. Build timber and rock platform. Chief Engineer/Standard Maintenance Procedure AFE Number CE 2005. Correspondence File Number A305. Other subject categories: Platform .

Spokane, Portland and Seattle Railway Authorization for Expenditure (AFE). President's AFE Number 1354. Fill bridge Number A-15-4, 2.9 miles west of Holbrook, Oregon, length 46 feet, account opening no longer used and it being necessary to renew this trestle if not filled. Chief Engineer/Standard Maintenance Procedure AFE Number CE 1452. Correspondence File Number A34-3. Portland Division. Other subject categories: Bridge Filling.