Photocopied draft: “Observations and Suggestions on Helicopter Skiing in the Province of British Columbia”. “File” written at top left corner.
Signed copy of “Helicopter Skiing in the Province of British Columbia”.
Signed photocopy of “Helicopter Skiing in the Province of British Columbia” Jan. 26, 197 [sic] (blue duotang)
Unsigned photocopy of “Helicopter Skiing in the Province of British Columbia”. “TAT” written at top left corner in pencil.
Signed copy (blue duotang) of “Helicopter Skiing in the Province of British Columbia” dated Jan. 26, 1976.
“Helicopter Skiing in the Province of British Columbia.” Dated in pencil at top right with “1973, Hans.”