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Barton, Albert Olaus La Follette's Winning of Wisconsin (1894-1904)

Henrici, Olaus Skeleton Structures: Especially in Their Application to the Building of Steel & Iron Bridges

Henrici, Olaus Elementary Geometry: Congruent Figures

Henrici, Olaus Elementary Geometry: Congruent Figures

Griffith, Evan Wild at Heart: The Story of Olaus and Mardy Murie, Defenders of Nature

Borrichius, Olaus Hermetis Aegyptiorum, Et Chemicorum Sapientia Ab Hermanni Conringii Animadversionibus Vindicata