NAPHA (National Amusement Park Historical Association) has a monthly NAPHAnewsFLASH!!! letter that briefly lists updates and additions to parks around the world. They also have NAPHA News (6 issues a year), it's full of history backgrounds of defunct parks or small unheard of parks, but it usually comes long-past due.
Also: I heard about a PA Coaster and Amusement Park Club, does anyone have any information on it?
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~*Grab the brass ring!*~