The Al Martino version, mentioned by Record Collector, turned up on the first Explosive Hits LP in 1970. As far as I'm aware, that's the ONLY way it was issued here. There is no Australian EMI-Capitol catalogue number for it as a single.
cant help falling in love would be based on the al martino version that appeared on EMI's Columbia label not to be confused with Columbia that is distrubited outside of the UK and Australia but that's another story as neil has mentioned in his post I also seen a lot of these but never bothered to buy them as I got some of these songs in my music library by the ORIGINAL groups and singers
I've seen these LPs, several volumes of which, at second-hand book & record shops and recycling centres in and around Newcastle(Australia) and Sandgate(a suburb of Newcastle), and up in my "neck of the woods", Port Stephens(40 or so minutes' drive north of Newcastle). Now I'm not sure who copied whom but EMI, in partnership with book publishers, Paul Hamlyn, were issuing several budget LPs on the Music For Pleasure label that had uncredited studio artists covering the then-current hits of the latter-half of the 1960s, the same recordings also turned up on Canadian ARC LPs around the same time.... curious, that!