This is a Crystal Park brochure from, we believe, the 1950's, as it states that Crystal Park is "open" after 30 years. It shows that there was a ski slope with rope tow lift, and that what's now the Clubhouse existed, with at least part of the covered deck. Snowplow Rock had not fallen yet.
If anyone can date this brochure more precisely, let us know through an email to historiccp@gmail.com.