Congresses and conventions

Secretary of the Interior Oscar Chapman (standing) speaks to the Bureau of Reclamation's Operations and Maintenance Regional Supervisors during a conference at the Department of the Interior. Also pictured: Senator Joseph C. O'Mahoney (seated, right of Chapman). All others unidentified.

Attendees of the Bureau of Reclamation's Operation and Maintenance Regional Supervisors' Conference pose for a picture on the steps of the Interior building. Pictured, front row: Assistant Secretary of the Interior William Warne (second from left); Secretary of the Interior Oscar Chapman (center); and Bureau of Reclamation Commissioner Michael Straus (second from right). All others unidentified.

An unidentified man speaks to the Bureau of Reclamation's Operation and Maintenance Regional Supervisors during a conference at the Department of the Interior. Also pictured: Secretary of the Interior Oscar Chapman (along back wall, left); and Senator Joseph C. O'Mahoney (along back wall, right). All others unidentified.

Secretary of the Interior Oscar Chapman (center) with unidentified men from the Bureau of Reclamation's Operation and Maintenance Regional Supervisors' Conference at the Department of the Interior.

Secretary of the Interior Oscar Chapman (standing) speaks to the Bureau of Reclamation's Operations and Maintenance Regional Supervisors during a conference at the Department of the Interior. Also pictured: Bureau of Reclamation Commissioner Michael Straus (left, against wall); and Senator Joseph C. O'Mahoney (seated, right of Chapman). All others unidentified.

Under Secretary of the Interior Oscar Chapman speaks at the American Petroleum Institute convention in Chicago, Illinois.

Under Secretary of the Interior Oscar Chapman (center) with two unidentified men at the American Petroleum Institute convention in Chicago, Illinois.

Under Secretary of the Interior Oscar Chapman speaks at the American Petroleum Institute convention in Chicago, Illinois.

From left to right: Andrew Biemiller, Special Assistant to the Secretary of the Interior; Secretary of the Interior Oscar Chapman; and an unidentified woman at the American Federation of Labor convention in San Francisco, California. From: Oscar Chapman Scrapbook

Secretary of the Interior Oscar Chapman (right) and Mayor of Lincoln, Nebraska Victor E. Anderson at the inland Governor's Convention in Omaha, Nebraska. From: Oscar Chapman Scrapbook