A couple people from Sweden are trying to document every major concert that took place at the Olympen in Lund, Sweden from the 70s through the 90s, in the form of a book. One of these gigs was a Queen show in 1974.
Any attempt to document music history is a worthy cause, as far as I'm concerned. They've done great work so far.
Give these guys a helping hand - they've got a crowd funding project on the go. I already did.
Two weeks until their Indiegogo runs out. link