I didn't use the card catalog, where, I suppose, all the books with the science fiction sticker on the spines would, I now assume, have been listed under "science fiction" as a subject heading. Perhaps it's just as well that I didn't get such a windfall as that would have been in one swoop. The sf was shelved in the general fiction (that was back in the day, wasn't it?) in the Coos Bay library when I was a kid there in the second half of the 1960s. So I just looked from shelf to shelf, scanning for titles. Now that I think of it, it surprises me that I didn't simply look for the sticker -- but I don't think I ever methodically went shelf by shelf looking for it. Perhaps I'm misremembering about the sticker.
But at any rate the kids' section included sf juveniles by del Rey, Wollheim, Silverberg, Heinlein, etc. I believe I found The John Wyndham Omnibus in the kids' section. The adult shelves included Poul Anderson's Three Hearts and Three Lions and a number of anthologies -- Galaxy, Magazine of Fantasy and SF... I remember Fred Hoyle's October the First Is Too Late being there, but I don't suppose I read it through. I don't know if there was all that much sf in the CB library, but there was some; and they had the Narnian books, Tolkien's fantasy, etc.
When we moved to Ashland, Oregon, I found that the library had a science fiction section in the adult collection...! I'm curious, Dave -- when as a youngster you were not supposed to go into the adult section, how old were you, approximately?
As for books to buy, you'd see sf paperbacks all the time in drugstore racks, etc.
Forgive me, but this will get a bit long-winded, because the story is complicated...
There actually was no real library in my home town -- it was too small for that. But a café in my town kept a bookshelf off to one side, and every couple of weeks someone drove over from the library in the county seat, with a batch of books, that were swapped for the ones that had been in the café for the previous two weeks...got the picture?
We did not get to go to the county seat (Ok, it was Marshall, Minnesota) very often -- my parents worked 12-hour days, seven days a week. But when I did manage to get there, I could not go into the main floor of the library building -- that was for adults. Kids had a separate space that was entered through a separate door that let one into the basement. The check-out desk was right inside the front door of the adult floor, so it was really difficult to sneak in...though I did try now and then...
And as for the auxiliary library in my town's café: the lady who ran the café was even stricter about the age restriction than they were in Marshall.
Frankly, I don't know exactly what age you had to be to be allowed into either library, but around the time I became a freshman in high school (which was also in Marshall), I began to get there more often -- and frequently with a valid research project to carry out -- so perhaps they just became used to me being around, or maybe I had just gotten old enough... at any rate, by the time I was at the end of my sophomore year, I was reading what I wanted.
As for the café branch: I think I just wore Adeline down with trying...
And in either library, there was so little sf that there was no separate section for it; when allowed to look, I -- like you -- just scanned the shelves for titles that sounded sf-nal. I think at that point I did not even have the concept of there being enough sf in the world to merit a separate section... (But as it happens, one of those few sf titles was RING AROUND THE SUN, by Clifford D. Simak...I don't know how many times I read it...)
"...see sf paperbacks all the time in drugstore racks, etc.": well, no drugstore in my hometown, either. (There were two drugstores in Marshall. One did not bother with books -- it was pretty small, probably no room -- and the other had one (count 'em, one) of those metal revolving racks that could hold about fifty paperbacks, or thereabouts -- but sf did not show up there very often (the local market appeared to require romances, westerns, and detective stories). (But that was where I found, and bought, my very first science fiction book: DOUBLE STAR by Robert A. Heinlein.) (I think I imprinted on it...)
by the way: are you still in Ashland? I have a cousin who lives there now...
Great talking to you!
Dave