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<br />Information Sheet 139 (July 1998) <br /> <br />Page 4 of 4 <br /> <br />@ IDA Inc., 3225 N. First Ave., Tucson, AZ 85719-2103 USA <br />Telephone: 1-520-293-3198 Fax: 520-293-3192 E-mail: ida@darksky.org <br />Web: <br /> <br />http://www.darksky.org/infoshts/isI39.htm1 <br /> <br /> <br />6/20/2005 <br />