These are from the fabulous Chris Mildner.
The following books are available at the Multnomah County Library
National Cyclopedia of American Biography (1893-1963) 920.07 N77
Who’s Who for Oregon (1936-44) 920.0795 W58 v. 1-3 (have to request at book pick-up)
Dictionary of National Biography (1901-1970) 920.042 D554
Biography Index (1946-2005) 920.B63
Current Biography (1940-2005) 920.C98
Encyclopedia of Northwest Biography
All of these books, particularly the Encylopedia of Northwest Biography, are great for looking at family trees and the history of some of the founding families of Oregon.