I’ve got the original (well, the only ones we were using back in the day) 5th edition in bass clef, and even the original 5th volume 2 in bass clef as well. I’ve got the standard C treble both 5th and 6th as well, plus a few others and then dozens in PDF format.
I’ll go slightly against the grain here...I don’t disagree with what anyone has said regarding learning treble clef, it’s a good skill to have but I also love having the bass clef version to break out just for reading practice or learning tunes and whatnot. It’s a cool thing to have.
Funny/true story:
While still in high school getting into music in the mid 80s, I found out about this mythical “Real Book” from a tenor playing friend of mine who was a far more advanced musician than I was at that time. He told me I had to get one, all the serious cats have it and if you wanna gig you gotta have it, blah blah. Of course at that time I had no inkling of it being an illegal book.
OK so I go to Modern Music in Ft. Lauderdale, and walk up to the counter, and the exchange goes something like this:
Me: Yeah, I’d like to get a Real Book.
Guy behind counter: What’s that?
Me: well, um it’s this book of jazz tunes, my friend said I needed to get it
Guy behind counter: no idea what you’re talking about
Me: really? You don’t have anything like that?
Guy behind counter: never heard of it
Me: huh? My buddy told me you can get them here. You SURE you don’t have them?
Then the guy literally takes a look left, then right, then looks at me and says “Stay right there.”
He is gone like 5 minutes, going to the back of the store and comes back Like a drug deal going down, he shows me an item wrapped in unmarked brown paper, lays it on the counter and says “$15, cash only.”
I got about 10 years out of that book, gradually losing pages at the front until I had the obvious idea of getting the covers laminated and getting them wire bound at Staples.