Vintage ONYX Cave Hamburg Pennsylvania-Anniversary 101 Years 1872-1973 Brochure. It opens up with a map as well. At this time admission was $2.50 for adults and children 12 and up $1.25 . Privately owned by Mr. Gordon Frazer. No pictures but more of drawings of the place. Nice piece of memorabilia of the now closed cave.    Very good condition. (EE)