File consists of catalogues for the exhibition 'Notations in Passion, 1970: Photographs by Nathan Lyons from the collection of the National Gallery of Canada', circulated by the National Gallery of Canada between 1971-1972. The exhibition was presented at Dalhousie Art Gallery in August 1972.

Catalogues contain an exhibition statement by Lyons, an introduction essay by James Borcoman, a catalogue, 12 b&w plates of Lyon's photographs, a chronological biography and C.V., and a selected bibiography. All text is provided in both English and French.