Guthrie-Hubner, Inc. Guthrie-Hubner, Inc. Search | Advanced Search | New Members | Coupons and Discounts | All Categories Automotive, Aviation & Marine >> Vessel Agents & Brokers Guthrie-Hubner, Inc. 102 South 21st Ave West, Suite #2Duluth, MN 55806 (218) 727-5011 | fax: (218) 727-4046