I always remember there being European employees (France, Spain, England, Portugal, Germany... I remember all those countries offhand), though eastern Europe and South America tend to be more dominant in numbers (Russia, Bolivia, Columbia...). The largest numbers of international employees arrive the end of May/beginning of June, but can often stay longer than American college students, so they are more noticeable toward the end of the season.
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/