Photograph of a photograph. The original picture was taken at night and shows the U. S. Government building constructed for the 1905 Lewis and Clark Centennial Exposition in Portland. The building is outlined in electric lights. A label below the original photograph reads “United States Government.”

Souvenir ticket for the Lewis and Clark Centennial exhibit from 1905, in Portland, Oregon. On the front of the ticket is a decorative illustration, showing Sacajawea, Meriwether Lewis, William Clark, the ship Columbia, and the Oregon Pony. The back of the ticket is individually numbered, with additional text.

Ticket for the 1905 Lewis and Clark Exposition in Portland, Oregon, signed by Thomas Robertson (1881-1924). The reverse of the ticket includes a photograph of Robertson wearing a hat and suit.

A printed copy of the poem, “Centennial Ode,” written by Abigail Scott Duniway in commemoration of the Lewis and Clark Exposition in 1905.

This photograph depicts the exterior of the Liberal Arts Building at the Lewis and Clark Centennial Exposition in 1905. This photograph appears to have been taken during construction, indicated by the scaffolding outside the building.

This photograph depicts the exterior of the Oriental Building at the Lewis and Clark Centennial Exposition in 1905. Construction equipment is visible near the building.

This photograph depicts the exterior of the Manufacturer's Building at the Lewis and Clark Centennial Exposition in 1905. This photograph appears to have been taken during construction, indicated by the scaffolding outside the building. A young child poses in the foreground.

This photograph depicts the exterior of the Forestry Building at the Lewis and Clark Centennial Exposition in 1905. This photograph was taken during construction of the building.

This photograph depicts a people using outdoor stairs at the Lewis and Clark Centennial Exposition in 1905. The Manufacturer's Building and construction scaffolding are visible in the background.

This photograph depicts two youths in front of the Oriental Building, part of the Lewis and Clark 1905 Centennial Exhibition. Construction materials are visible nearby.

This photograph depicts an exterior view of the Agricultural Building featured at the Lewis and Clark Centennial Exposition in 1905. Several people are visible throughout the photograph.

This photograph depicts an exterior view of the Forestry Building featured at the Lewis and Clark Centennial Exposition in 1905. A woman wearing a dark-colored dress is visible standing in the foreground.

A photograph of the interior of the Post Office Stamp Division inside the Government Buildings at the Lewis and Clark Centennial Exposition.

A photograph of the Bureau of Plant Industry in the Government Buildings at the Lewis and Clark Centennial Exposition. A plaque at the top of the photograph reads, "Bureau of Plant Industry Seed Laboratory." The back of the print reads, "Bu. Pl. Ind Pure seed investigations."

A photograph of the Post Office Department in the Government Buildings at the Lewis and Clark Centennial Exposition.

A photograph of the Bureau of Plant Industry in the Government Buildings at the Lewis and Clark Centennial Exposition. The Weather Bureau and the Bureau of Animal Industry are visible in the background. The back of the print reads, "Agr Dept, Bureau of Plant Industry."

A photograph of the Bureau of Animal Industry in the Government Buildings at the Lewis and Clark Centennial Exposition. A Weather Bureau Kite is visible hanging from the ceiling.

A photograph showing Guild's Lake. The American Inn, the hotel that was built on the grounds of the Lewis and Clark Centennial Exposition, is visible on the shore.

A photograph showing the construction of the U.S. Government Buildings for the Lewis and Clark Exposition at Guild's Lake. Mount Saint Helens is visible in the distance.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake. The American Inn is visible at the bottom of the photograph. Mount Saint Helens is visible in the distance.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake. The American Inn is visible at the bottom of the photograph. Mount Saint Helens is visible in the distance.

A glass positive of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake. Mount Saint Helens is visible in the distance.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake. The American Inn is visible at the bottom of the photograph. Mount Saint Helens is visible in the distance.

A photograph of the skyline of the Lewis and Clark Centennial Exposition. Buildings visible include the Washington Building, the Foreign Palace, and the Agriculture and Horticulture Building.

A photograph of the U.S. Government Buildings at the Lewis and Clark Centennial Exposition at Guild's Lake. Part of the American Inn is visible in the bottom left corner of the photograph.