Ola Tjorhom (Tjorhom, Ola)

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  Apostolicity and Unity
  by Ola Tjorhom
  Softcover, Consul Oecumenique, ISBN 2825413755 (2-8254-1375-5)
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  Apostolicity and Unity: Essays on the Porvoo Common Statement
  by Ola Tjorhom, David Hope, K. G. Hammar
  Softcover, Eerdmans Pub Co, ISBN 0802809693 (0-8028-0969-3)
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  Visible Church-Visible Unity: Ecumenical Ecclesiology and "the Great Tradition of the Church"
  by Ola Tjrhom, Geoffrey Wainwrigh
  Softcover, Liturgical Pr, ISBN 0814628737 (0-8146-2873-7)