Dear John M,
I found references to 4 articles written by Sola on BMUSE, and one
interview with him reported in both English and French texts. Any one of
these may give you a full citation on "Essays on Museums and Their
Theory".
My next suggestion would be to contact the Library of the Canadian
Conservation Institute to see if they have this reference. The CCI
Library has one of the best and largest museology collections of which I
am aware. They can be contacted by email at
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Leslie Munro.