It was a BIG thing in the 70’s. Started for me in 5th grade in 1975. Grew up in a college town and I would ride my bike all over town to dumpster dive behind all the bars downtown, campus dorms and frat houses especially on Sunday mornings. This was before recycling took hold so they were EVERYWHERE...in bushes, ditches out in the country, old Farm landfills. Got poison ivy many times while crawling through over-grown sides of the road. Still have some of the books that were published and was a member of the World Wide Beer Can Collectors WWBCC. There were Can-ventions by the BCCA but my parents wouldn’t think of going. I even talked my mom into buying me beer at the store numerous time to get all the Schmidt outdoor scene cans. Think I had over 1,000 and sold them for about $ 120 in the mid 80’s.