Dwinnell Dam, 1961: front ad section photos (construction, 1927), 66, 70, 83, 86 photos, 86-89 (history of), 93, 94, back ad section photos (under construction); 1977: 27; 1980: 26, 47, 79, 87 photo, 88 photo; 1985: viii, 26, 119; 1986: 81; 1989: 122; 1991: 24; 1994: 74; 2010: 84
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