Whilst I'm at it I have a lot of 50s somewhere. Have you any gaps?
My only 50s gaps are:
1950 Spring & Autumn
After that I've got them all up until the mid 80s.

Of course, I often offer to copy pages, or transcribe songs, so I consider my collection more as a 'general resource' although I keep tight hold of it. Spares often end up on eBay, for low prices (as I only get them with bulk purchases where I'm after something specific), or, just before Christmas I took a large pile of spares to the Cardiff Folk Club (more of an 'open mike' these days), as freebies for those who wanted them.